452
FNUS55 KBYZ 200803
FWFBYZ
FIRE WEATHER PLANNING FORECAST FOR SCEN AND SERN MONTANA
NATIONAL WEATHER SERVICE BILLINGS MT
203 AM MDT SUN SEP 20 2026
..WARMER AND DRIER STARTING MONDAY
DISCUSSION
COOL AND WET WEATHER CONTINUES TODAY, BUT SHOWERS WILL TAPER OFF
FROM WEST TO EAST THIS AFTERNOON AND EVENING AS THE WEATHER SYSTEM
SLOWLY EXITS. HEAVIEST RAIN TODAY (ADDITIONAL 0.25-0.75") WILL BE
EAST OF RYEGATE-COLUMBUS-RED LODGE. A WARMING & DRYING TREND
BEGINS MONDAY. EXPECT ABOVE NORMAL TEMPERATURES AND MIN RHS IN THE
20S AND 30S THROUGH THE SECOND HALF OF THE WEEK. THERE MAY BE A
SHORT OPPORTUNITY FOR SCATTERED SHOWERS TUESDAY NIGHT INTO
WEDNESDAY. JKL
MTZ123-202230-
GALLATIN NATIONAL FOREST-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........MOSTLY SUNNY. PATCHY FOG IN THE MORNING.
* MAX TEMPERATURE.......60-69 AT 5000 FEET...49-59 AT 7000 FEET.
* 24 HR TREND.........6 DEGREES WARMER.
* MIN HUMIDITY..........45-55 PERCENT AT 5000 FEET...52-62 PERCENT
AT 7000 FEET.
* 24 HR TREND.........31 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........LIGHT WINDS IN THE MORNING BECOMING
NORTHWEST 5 TO 10 MPH IN THE AFTERNOON.
* RIDGETOP.............WEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...4 PERCENT.
* CWR...................ZERO.
TONIGHT
* SKY/WEATHER...........MOSTLY CLEAR.
* MIN TEMPERATURE.......37-46 AT 5000 FEET...32-42 AT 7000 FEET.
* 24 HR TREND.........2 DEGREES COOLER.
* MAX HUMIDITY..........80-90 PERCENT AT 5000 FEET...76-86 PERCENT
AT 7000 FEET.
* 24 HR TREND.........28 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........SOUTHEAST WINDS 5 TO 10 MPH.
* RIDGETOP.............NORTHWEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...3 PERCENT.
* CWR...................ZERO.
MONDAY
* SKY/WEATHER...........SUNNY.
* MAX TEMPERATURE.......67-77 AT 5000 FEET...56-66 AT 7000 FEET.
* 24 HR TREND.........8 DEGREES WARMER.
* MIN HUMIDITY..........24-34 PERCENT AT 5000 FEET...28-38 PERCENT
AT 7000 FEET.
* 24 HR TREND.........19 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........SOUTHEAST WINDS 5 TO 10 MPH IN THE MORNING
SHIFTING TO THE NORTH IN THE AFTERNOON.
* RIDGETOP.............WEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...1 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 39 TO 48. SOUTH WINDS 5 TO
10 MPH.
TUESDAY
PARTLY CLOUDY. LOWS 43 TO 53. HIGHS 70 TO 80. SOUTH
WINDS 5 TO 10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 43 TO 53. HIGHS 70 TO 79.
SOUTHWEST WINDS 5 TO 10 MPH.
THURSDAY
PARTLY CLOUDY. LOWS 44 TO 54. HIGHS 73 TO 82. SOUTH
WINDS 5 TO 15 MPH.
FRIDAY
PARTLY CLOUDY. LOWS 45 TO 55. HIGHS 74 TO 82.
SATURDAY
MOSTLY SUNNY. HIGHS 67 TO 77.
MTZ124-202230-
WHEATLAND COUNTY/SWEET GRASS COUNTY-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........MOSTLY CLOUDY IN THE MORNING THEN BECOMING
MOSTLY SUNNY. PATCHY FOG IN THE MORNING. ISOLATED RAIN SHOWERS.
* MAX TEMPERATURE.......64-69.
* 24 HR TREND.........9 DEGREES WARMER.
* MIN HUMIDITY..........47-52 PERCENT.
* 24 HR TREND.........23 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............NORTH WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...5 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY. PATCHY FOG IN THE EVENING,
THEN AREAS OF DENSE FOG OVERNIGHT.
* MIN TEMPERATURE.......42-47.
* 24 HR TREND.........2 DEGREES COOLER.
* MAX HUMIDITY..........90-95 PERCENT.
* 24 HR TREND.........4 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTHEAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...4 PERCENT.
* CWR...................ZERO.
MONDAY
* SKY/WEATHER...........PARTLY SUNNY IN THE MORNING THEN CLEARING.
AREAS OF DENSE FOG IN THE MORNING.
* MAX TEMPERATURE.......69-74.
* 24 HR TREND.........5 DEGREES WARMER.
* MIN HUMIDITY..........37-42 PERCENT.
* 24 HR TREND.........10 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTHEAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...0 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 42 TO 47. SOUTHEAST WINDS 5 TO
10 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 46 TO 51. HIGHS 75 TO 80. SOUTHWEST
WINDS 5 TO 10 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 45 TO 50. HIGHS 75 TO 80. WEST
WINDS 5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 46 TO 51. HIGHS 76 TO 81. SOUTH
WINDS 5 TO 15 MPH.
FRIDAY
PARTLY CLOUDY. LOWS 46 TO 51. HIGHS 78 TO 83.
SATURDAY
MOSTLY SUNNY. HIGHS 69 TO 74.
MTZ125-202230-
STILLWATER COUNTY-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........MOSTLY CLOUDY. PATCHY FOG IN THE MORNING.
SCATTERED RAIN SHOWERS IN THE MORNING, THEN ISOLATED RAIN SHOWERS
IN THE AFTERNOON.
* MAX TEMPERATURE.......61-66.
* 24 HR TREND.........6 DEGREES WARMER.
* MIN HUMIDITY..........49-54 PERCENT.
* 24 HR TREND.........15 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............NORTHWEST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...7 PERCENT.
* CWR...................10 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY. ISOLATED RAIN SHOWERS IN THE
EVENING. PATCHY FOG IN THE EVENING, THEN AREAS OF DENSE FOG
OVERNIGHT.
* MIN TEMPERATURE.......43-48.
* 24 HR TREND.........2 DEGREES COOLER.
* MAX HUMIDITY..........78-83 PERCENT.
* 24 HR TREND.........13 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTHEAST WINDS 5 TO 10 MPH IN THE EVENING
BECOMING LIGHT OVERNIGHT.
* CHANCE OF LIGHTNING...5 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
MONDAY
* SKY/WEATHER...........MOSTLY SUNNY. AREAS OF DENSE FOG IN THE
MORNING.
* MAX TEMPERATURE.......69-74.
* 24 HR TREND.........8 DEGREES WARMER.
* MIN HUMIDITY..........35-40 PERCENT.
* 24 HR TREND.........14 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............LIGHT WINDS IN THE MORNING BECOMING EAST 5
TO 10 MPH IN THE AFTERNOON.
* CHANCE OF LIGHTNING...2 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 44 TO 49. SOUTH WINDS 5 TO
10 MPH.
TUESDAY
PARTLY CLOUDY. ISOLATED SHOWERS. LOWS 48 TO 53. HIGHS
74 TO 79. SOUTH WINDS 5 TO 10 MPH.
WEDNESDAY
PARTLY CLOUDY. LOWS 47 TO 52. HIGHS 75 TO 80. WEST
WINDS 5 TO 10 MPH.
THURSDAY
PARTLY CLOUDY. LOWS 48 TO 53. HIGHS 77 TO 82. SOUTH
WINDS 5 TO 10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 50 TO 55. HIGHS 80 TO 85.
SATURDAY
MOSTLY SUNNY. HIGHS 72 TO 77.
MTZ126-202230-
BEARTOOTH RANGER DISTRICT CUSTER NATIONAL FOREST-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........PATCHY FOG IN THE MORNING. MOSTLY CLOUDY
WITH SCATTERED RAIN SHOWERS.
* MAX TEMPERATURE.......56-62 AT 5000 FEET...47-57 AT 7000 FEET.
* 24 HR TREND.........4 DEGREES WARMER.
* MIN HUMIDITY..........57-67 PERCENT AT 5000 FEET...61-71 PERCENT
AT 7000 FEET.
* 24 HR TREND.........14 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........NORTHWEST WINDS 5 TO 15 MPH.
* RIDGETOP.............WEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...9 PERCENT.
* CWR...................20 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY WITH ISOLATED RAIN SHOWERS IN
THE EVENING, THEN MOSTLY CLEAR OVERNIGHT.
* MIN TEMPERATURE.......43-48 AT 5000 FEET...36-46 AT 7000 FEET.
* 24 HR TREND.........5 DEGREES WARMER.
* MAX HUMIDITY..........73-78 PERCENT.
* 24 HR TREND.........25 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........WEST WINDS 5 TO 10 MPH.
* RIDGETOP.............WEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...5 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
MONDAY
* SKY/WEATHER...........MOSTLY SUNNY.
* MAX TEMPERATURE.......62-70 AT 5000 FEET...56-66 AT 7000 FEET.
* 24 HR TREND.........7 DEGREES WARMER.
* MIN HUMIDITY..........34-41 PERCENT AT 5000 FEET...36-46 PERCENT
AT 7000 FEET.
* 24 HR TREND.........25 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........SOUTHEAST WINDS 5 TO 10 MPH.
* RIDGETOP.............LIGHT WINDS.
* CHANCE OF LIGHTNING...5 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 45 TO 52. SOUTHWEST WINDS 5 TO
15 MPH.
TUESDAY
PARTLY CLOUDY. SCATTERED SHOWERS. LOWS 49 TO 56. HIGHS
68 TO 77. SOUTH WINDS 5 TO 15 MPH.
WEDNESDAY
PARTLY CLOUDY. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS 48 TO 56. HIGHS 68 TO 77. WEST WINDS 5 TO
15 MPH.
THURSDAY
PARTLY CLOUDY. LOWS 50 TO 58. HIGHS 71 TO 80. SOUTH
WINDS 5 TO 15 MPH.
FRIDAY
PARTLY CLOUDY. LOWS 51 TO 58. HIGHS 73 TO 82.
SATURDAY
MOSTLY SUNNY. HIGHS 69 TO 76.
MTZ127-202230-
GOLDEN VALLEY COUNTY/MUSSELSHELL COUNTY-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........MOSTLY CLOUDY. PATCHY FOG IN THE MORNING.
RAIN SHOWERS IN THE MORNING, THEN SCATTERED RAIN SHOWERS IN THE
AFTERNOON.
* MAX TEMPERATURE.......55-60.
* 24 HR TREND.........4 DEGREES WARMER.
* MIN HUMIDITY..........87-92 PERCENT.
* 24 HR TREND.........4 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............NORTH WINDS 5 TO 15 MPH.
* CHANCE OF LIGHTNING...10 PERCENT.
* CWR...................70 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY. ISOLATED RAIN SHOWERS IN THE
EVENING. PATCHY FOG IN THE EVENING, THEN AREAS OF DENSE FOG
OVERNIGHT.
* MIN TEMPERATURE.......47-52.
* 24 HR TREND.........1 DEGREE COOLER.
* MAX HUMIDITY..........94-99 PERCENT.
* 24 HR TREND.........4 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTHEAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...4 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
MONDAY
* SKY/WEATHER...........CLOUDY IN THE MORNING THEN BECOMING MOSTLY
SUNNY. AREAS OF DENSE FOG IN THE MORNING.
* MAX TEMPERATURE.......62-67.
* 24 HR TREND.........7 DEGREES WARMER.
* MIN HUMIDITY..........46-51 PERCENT.
* 24 HR TREND.........41 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTH WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...1 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 46 TO 51. SOUTHEAST WINDS 5 TO
10 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 52 TO 57. HIGHS 70 TO 75. SOUTH
WINDS 5 TO 10 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 50 TO 55. HIGHS 73 TO 78.
SOUTHWEST WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 51 TO 56. HIGHS 73 TO 78. SOUTH
WINDS 5 TO 10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 52 TO 57. HIGHS 76 TO 81.
SATURDAY
MOSTLY SUNNY. HIGHS 67 TO 72.
MTZ128-202230-
YELLOWSTONE COUNTY-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........MOSTLY CLOUDY. PATCHY FOG IN THE MORNING.
RAIN SHOWERS IN THE MORNING, THEN SCATTERED RAIN SHOWERS IN THE
AFTERNOON.
* MAX TEMPERATURE.......61-66.
* 24 HR TREND.........6 DEGREES WARMER.
* MIN HUMIDITY..........71-76 PERCENT.
* 24 HR TREND.........17 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............NORTHWEST WINDS 5 TO 15 MPH.
* CHANCE OF LIGHTNING...8 PERCENT.
* CWR...................80 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY. ISOLATED RAIN SHOWERS IN THE
EVENING. PATCHY FOG IN THE EVENING, THEN AREAS OF DENSE FOG
OVERNIGHT.
* MIN TEMPERATURE.......47-52.
* 24 HR TREND.........2 DEGREES COOLER.
* MAX HUMIDITY..........93-98 PERCENT.
* 24 HR TREND.........5 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............NORTHEAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...4 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
MONDAY
* SKY/WEATHER...........CLOUDY IN THE MORNING THEN CLEARING. AREAS
OF DENSE FOG IN THE MORNING.
* MAX TEMPERATURE.......68-73.
* 24 HR TREND.........7 DEGREES WARMER.
* MIN HUMIDITY..........39-44 PERCENT.
* 24 HR TREND.........32 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............EAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...0 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 46 TO 51. SOUTHEAST WINDS 5 TO
10 MPH.
TUESDAY
MOSTLY CLEAR. ISOLATED SHOWERS. LOWS 51 TO 56. HIGHS
76 TO 81. SOUTH WINDS 5 TO 10 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 51 TO 56. HIGHS 77 TO 82.
SOUTHWEST WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 51 TO 56. HIGHS 79 TO 84. SOUTH
WINDS 5 TO 10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 52 TO 57. HIGHS 81 TO 86.
SATURDAY
MOSTLY SUNNY. HIGHS 73 TO 78.
MTZ129-202230-
CROW INDIAN RESERVATION/BIGHORN CANYON REC AREA-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........CLOUDY. PATCHY FOG IN THE MORNING. RAIN
SHOWERS IN THE MORNING, THEN RAIN SHOWERS AND ISOLATED
THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.......53-63 AT 5000 FEET...48-53 AT 7000 FEET.
* 24 HR TREND.........2 DEGREES COOLER.
* MIN HUMIDITY..........67-77 PERCENT AT 5000 FEET...75-85 PERCENT
AT 7000 FEET.
* 24 HR TREND.........4 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........NORTHWEST WINDS 5 TO 15 MPH.
* RIDGETOP.............NORTHWEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...16 PERCENT.
* CWR...................90 PERCENT.
TONIGHT
* SKY/WEATHER...........CLOUDY. SCATTERED RAIN SHOWERS IN THE
EVENING, THEN ISOLATED RAIN SHOWERS OVERNIGHT. PATCHY FOG THROUGH
THE NIGHT.
* MIN TEMPERATURE.......44-49 AT 5000 FEET...40-45 AT 7000 FEET.
* 24 HR TREND.........1 DEGREE COOLER.
* MAX HUMIDITY..........81-91 PERCENT AT 5000 FEET...77-87 PERCENT
AT 7000 FEET.
* 24 HR TREND.........4 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........NORTHEAST WINDS 5 TO 10 MPH IN THE EVENING
SHIFTING TO THE SOUTHEAST OVERNIGHT.
* RIDGETOP.............NORTHWEST 5 TO 15 MPH.
* CHANCE OF LIGHTNING...9 PERCENT.
* CWR...................40 PERCENT.
MONDAY
* SKY/WEATHER...........MOSTLY CLOUDY IN THE MORNING THEN CLEARING.
PATCHY FOG IN THE MORNING.
* MAX TEMPERATURE.......62-72 AT 5000 FEET...55-62 AT 7000 FEET.
* 24 HR TREND.........11 DEGREES WARMER.
* MIN HUMIDITY..........38-48 PERCENT AT 5000 FEET...43-53 PERCENT
AT 7000 FEET.
* 24 HR TREND.........43 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........SOUTHEAST WINDS 5 TO 10 MPH.
* RIDGETOP.............NORTHWEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...2 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 45 TO 52. SOUTHEAST WINDS 5 TO
15 MPH.
TUESDAY
MOSTLY CLEAR. ISOLATED SHOWERS AND THUNDERSTORMS. LOWS
51 TO 56. HIGHS 69 TO 79. SOUTHEAST WINDS 5 TO 10 MPH.
WEDNESDAY
MOSTLY CLEAR. ISOLATED SHOWERS. LOWS 51 TO 56. HIGHS
68 TO 78. WEST WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 52 TO 58. HIGHS 72 TO 82.
SOUTHEAST WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 53 TO 58. HIGHS 73 TO 83.
SATURDAY
MOSTLY SUNNY. HIGHS 67 TO 77.
MTZ130-202230-
NORTHERN ROSEBUD/NORTHERN TREASURE COUNTIES-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........CLOUDY. PATCHY FOG IN THE MORNING. RAIN
SHOWERS IN THE MORNING, THEN RAIN SHOWERS AND ISOLATED
THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.......60-65.
* 24 HR TREND.........UNCHANGED.
* MIN HUMIDITY..........88-93 PERCENT.
* 24 HR TREND.........12 PERCENT WETTER.
* WIND (20 FT)
* PLAINS...............EAST WINDS 5 TO 15 MPH.
* CHANCE OF LIGHTNING...16 PERCENT.
* CWR...................80 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY. ISOLATED RAIN SHOWERS IN THE
EVENING. PATCHY FOG THROUGH THE NIGHT.
* MIN TEMPERATURE.......46-51.
* 24 HR TREND.........4 DEGREES COOLER.
* MAX HUMIDITY..........100 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* PLAINS...............EAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...5 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
MONDAY
* SKY/WEATHER...........PARTLY SUNNY. PATCHY FOG IN THE MORNING.
* MAX TEMPERATURE.......68-73.
* 24 HR TREND.........8 DEGREES WARMER.
* MIN HUMIDITY..........44-49 PERCENT.
* 24 HR TREND.........44 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTHEAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...0 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 46 TO 51. SOUTHEAST WINDS 5 TO
15 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 49 TO 54. HIGHS 76 TO 81. SOUTHEAST
WINDS 5 TO 10 MPH.
WEDNESDAY
MOSTLY CLEAR. ISOLATED SHOWERS. LOWS 49 TO 54. HIGHS
76 TO 81. SOUTH WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 52 TO 57. HIGHS 79 TO 84.
SOUTHEAST WINDS 5 TO 10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 52 TO 57. HIGHS 82 TO 87.
SATURDAY
MOSTLY SUNNY. HIGHS 74 TO 79.
MTZ131-202230-
NORTHERN CHEYENNE INDIAN RESERVATION/ASHLAND RANGER DISTRICT
CUSTER NATL FOREST-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........CLOUDY. PATCHY FOG IN THE MORNING. RAIN
SHOWERS IN THE MORNING, THEN RAIN SHOWERS AND ISOLATED
THUNDERSTORMS IN THE AFTERNOON.
* MAX TEMPERATURE.......59-64.
* 24 HR TREND.........4 DEGREES COOLER.
* MIN HUMIDITY..........80-85 PERCENT.
* 24 HR TREND.........1 PERCENT WETTER.
* WIND (20 FT)
* SLOPE/VALLEY.........NORTHWEST WINDS 5 TO 15 MPH.
* RIDGETOP.............LIGHT WINDS.
* CHANCE OF LIGHTNING...20 PERCENT.
* CWR...................80 PERCENT.
TONIGHT
* SKY/WEATHER...........CLOUDY. SCATTERED RAIN SHOWERS IN THE
EVENING. PATCHY FOG THROUGH THE NIGHT.
* MIN TEMPERATURE.......44-49.
* 24 HR TREND.........4 DEGREES COOLER.
* MAX HUMIDITY..........100 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* SLOPE/VALLEY.........EAST WINDS 5 TO 10 MPH.
* RIDGETOP.............NORTHWEST 5 TO 15 MPH.
* CHANCE OF LIGHTNING...10 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
MONDAY
* SKY/WEATHER...........MOSTLY CLOUDY IN THE MORNING THEN BECOMING
MOSTLY SUNNY. PATCHY FOG IN THE MORNING.
* MAX TEMPERATURE.......67-72.
* 24 HR TREND.........8 DEGREES WARMER.
* MIN HUMIDITY..........45-50 PERCENT.
* 24 HR TREND.........35 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........SOUTHEAST WINDS 5 TO 10 MPH.
* RIDGETOP.............NORTHWEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...2 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 45 TO 50. SOUTHEAST WINDS 5 TO
15 MPH.
TUESDAY
MOSTLY CLEAR. ISOLATED SHOWERS. LOWS 48 TO 53. HIGHS
76 TO 81. SOUTHEAST WINDS 5 TO 15 MPH.
WEDNESDAY
MOSTLY CLEAR. LOWS 47 TO 52. HIGHS 76 TO 81.
SOUTHWEST WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 51 TO 56. HIGHS 81 TO 86. SOUTH
WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 51 TO 56. HIGHS 83 TO 88.
SATURDAY
SUNNY. HIGHS 76 TO 81.
MTZ132-202230-
CUSTER COUNTY-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........PATCHY FOG IN THE MORNING. CLOUDY WITH RAIN
SHOWERS.
* MAX TEMPERATURE.......58-63.
* 24 HR TREND.........3 DEGREES COOLER.
* MIN HUMIDITY..........85-90 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* PLAINS...............EAST WINDS 10 TO 20 MPH.
* CHANCE OF LIGHTNING...11 PERCENT.
* CWR...................90 PERCENT.
TONIGHT
* SKY/WEATHER...........CLOUDY. SCATTERED RAIN SHOWERS IN THE
EVENING. PATCHY FOG OVERNIGHT.
* MIN TEMPERATURE.......46-51.
* 24 HR TREND.........4 DEGREES COOLER.
* MAX HUMIDITY..........100 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* PLAINS...............EAST WINDS 5 TO 15 MPH.
* CHANCE OF LIGHTNING...3 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
MONDAY
* SKY/WEATHER...........MOSTLY SUNNY. PATCHY FOG IN THE MORNING.
* MAX TEMPERATURE.......64-69.
* 24 HR TREND.........6 DEGREES WARMER.
* MIN HUMIDITY..........45-50 PERCENT.
* 24 HR TREND.........40 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTHEAST WINDS 5 TO 15 MPH.
* CHANCE OF LIGHTNING...1 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 46 TO 51. SOUTHEAST WINDS
10 TO 20 MPH.
TUESDAY
MOSTLY CLEAR. LOWS 50 TO 55. HIGHS 72 TO 77. SOUTHEAST
WINDS 5 TO 15 MPH.
WEDNESDAY
PARTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS 51 TO 56. HIGHS 75 TO 80. SOUTH WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 54 TO 59. HIGHS 79 TO 84. SOUTH
WINDS 5 TO 10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 55 TO 60. HIGHS 81 TO 86.
SATURDAY
SUNNY. HIGHS 74 TO 79.
MTZ133-202230-
SIOUX RANGER DISTRICT CUSTER NATIONAL FOREST-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........PATCHY FOG IN THE MORNING. CLOUDY WITH RAIN
SHOWERS AND ISOLATED THUNDERSTORMS.
* MAX TEMPERATURE.......57-62.
* 24 HR TREND.........6 DEGREES COOLER.
* MIN HUMIDITY..........85-90 PERCENT.
* 24 HR TREND.........9 PERCENT WETTER.
* WIND (20 FT)
* PLAINS...............EAST WINDS 10 TO 20 MPH. GUSTS UP TO 30 MPH
IN THE AFTERNOON.
* CHANCE OF LIGHTNING...24 PERCENT.
* CWR...................90 PERCENT.
TONIGHT
* SKY/WEATHER...........CLOUDY. RAIN SHOWERS IN THE EVENING, THEN
SCATTERED RAIN SHOWERS OVERNIGHT. PATCHY FOG OVERNIGHT.
* MIN TEMPERATURE.......45-50.
* 24 HR TREND.........5 DEGREES COOLER.
* MAX HUMIDITY..........100 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* PLAINS...............EAST WINDS 5 TO 15 MPH.
* CHANCE OF LIGHTNING...5 PERCENT.
* CWR...................50 PERCENT.
MONDAY
* SKY/WEATHER...........PATCHY FOG IN THE MORNING. CLOUDY WITH
ISOLATED RAIN SHOWERS IN THE MORNING, THEN PARTLY SUNNY IN THE
AFTERNOON.
* MAX TEMPERATURE.......62-67.
* 24 HR TREND.........5 DEGREES WARMER.
* MIN HUMIDITY..........54-59 PERCENT.
* 24 HR TREND.........31 PERCENT DRIER.
* WIND (20 FT)
* PLAINS...............SOUTHEAST WINDS 10 TO 20 MPH. GUSTS UP TO 30
MPH IN THE AFTERNOON.
* CHANCE OF LIGHTNING...2 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLOUDY. LOWS 45 TO 50. SOUTHEAST WINDS
10 TO 20 MPH WITH GUSTS TO AROUND 30 MPH.
TUESDAY
PARTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS 48 TO 53. HIGHS 70 TO 75. SOUTHEAST WINDS 10 TO 20 MPH WITH
GUSTS TO AROUND 35 MPH.
WEDNESDAY
PARTLY CLOUDY. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS 50 TO 55. HIGHS 76 TO 81. SOUTH WINDS 5 TO
15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 52 TO 57. HIGHS 80 TO 85. SOUTH
WINDS 5 TO 10 MPH.
FRIDAY
PARTLY CLOUDY. LOWS 53 TO 58. HIGHS 80 TO 85.
SATURDAY
SUNNY. HIGHS 78 TO 83.
WYZ274-202230-
SHERIDAN COUNTY-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........PATCHY FOG IN THE MORNING. CLOUDY WITH RAIN
SHOWERS.
* MAX TEMPERATURE.......57-62.
* 24 HR TREND.........3 DEGREES COOLER.
* MIN HUMIDITY..........75-80 PERCENT.
* 24 HR TREND.........3 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........NORTHWEST WINDS 5 TO 15 MPH.
* RIDGETOP.............NORTHWEST 10 TO 20 MPH.
* CHANCE OF LIGHTNING...13 PERCENT.
* CWR...................80 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY. NUMEROUS RAIN SHOWERS IN THE
EVENING. AREAS OF DENSE FOG THROUGH THE NIGHT.
* MIN TEMPERATURE.......40-45.
* 24 HR TREND.........6 DEGREES COOLER.
* MAX HUMIDITY..........100 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* SLOPE/VALLEY.........NORTHWEST WINDS 5 TO 10 MPH IN THE EVENING
BECOMING LIGHT OVERNIGHT.
* RIDGETOP.............NORTHWEST 10 TO 20 MPH.
* CHANCE OF LIGHTNING...10 PERCENT.
* CWR...................30 PERCENT.
MONDAY
* SKY/WEATHER...........MOSTLY CLOUDY IN THE MORNING THEN CLEARING.
AREAS OF DENSE FOG IN THE MORNING.
* MAX TEMPERATURE.......68-73.
* 24 HR TREND.........11 DEGREES WARMER.
* MIN HUMIDITY..........43-48 PERCENT.
* 24 HR TREND.........32 PERCENT DRIER.
* WIND (20 FT)
* SLOPE/VALLEY.........LIGHT WINDS IN THE MORNING BECOMING EAST 5
TO 10 MPH IN THE AFTERNOON.
* RIDGETOP.............NORTHWEST 5 TO 10 MPH.
* CHANCE OF LIGHTNING...8 PERCENT.
* CWR...................ZERO.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 38 TO 43. SOUTH WINDS 5 TO
10 MPH.
TUESDAY
MOSTLY CLEAR. ISOLATED SHOWERS. LOWS 44 TO 49. HIGHS
75 TO 80. SOUTHEAST WINDS 5 TO 10 MPH.
WEDNESDAY
PARTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS 43 TO 48. HIGHS 76 TO 81. WEST WINDS 5 TO 10 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 46 TO 51. HIGHS 80 TO 85. SOUTH
WINDS 5 TO 10 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 47 TO 52. HIGHS 81 TO 86.
SATURDAY
SUNNY. HIGHS 77 TO 82.
WYZ284-202230-
BIGHORN NATIONAL FOREST-
203 AM MDT SUN SEP 20 2026
TODAY
* SKY/WEATHER...........PATCHY FOG IN THE MORNING. CLOUDY WITH RAIN
SHOWERS.
* MAX TEMPERATURE.......46-51.
* 24 HR TREND.........4 DEGREES COOLER.
* MIN HUMIDITY..........81-86 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* AT BURGESS JCT.......NORTHWEST WINDS 5 TO 15 MPH.
* CHANCE OF LIGHTNING...12 PERCENT.
* CWR...................80 PERCENT.
TONIGHT
* SKY/WEATHER...........MOSTLY CLOUDY. NUMEROUS RAIN SHOWERS IN THE
EVENING.
* MIN TEMPERATURE.......28-33.
* 24 HR TREND.........5 DEGREES COOLER.
* MAX HUMIDITY..........100 PERCENT.
* 24 HR TREND.........UNCHANGED.
* WIND (20 FT)
* AT BURGESS JCT.......WEST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...9 PERCENT.
* CWR...................20 PERCENT.
MONDAY
* SKY/WEATHER...........PARTLY SUNNY. ISOLATED RAIN SHOWERS IN THE
AFTERNOON.
* MAX TEMPERATURE.......54-59.
* 24 HR TREND.........8 DEGREES WARMER.
* MIN HUMIDITY..........50-55 PERCENT.
* 24 HR TREND.........31 PERCENT DRIER.
* WIND (20 FT)
* AT BURGESS JCT.......EAST WINDS 5 TO 10 MPH.
* CHANCE OF LIGHTNING...8 PERCENT.
* CWR...................LESS THAN 10 PERCENT.
FORECAST DAYS 3 THROUGH 7...
MONDAY NIGHT
MOSTLY CLEAR. LOWS 31 TO 36. SOUTH WINDS 5 TO
15 MPH.
TUESDAY
MOSTLY CLEAR. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS 37 TO 42. HIGHS 62 TO 67. SOUTH WINDS 5 TO
15 MPH.
WEDNESDAY
PARTLY CLOUDY. SCATTERED SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS 37 TO 42. HIGHS 61 TO 66. SOUTHWEST WINDS
5 TO 15 MPH.
THURSDAY
MOSTLY CLEAR. LOWS 39 TO 44. HIGHS 65 TO 70. SOUTH
WINDS 5 TO 15 MPH.
FRIDAY
MOSTLY CLEAR. LOWS 41 TO 46. HIGHS 66 TO 71.
SATURDAY
SUNNY. HIGHS 63 TO 68.
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