717
FPUS55 KBOI 180831
ZFPBOI
ZONE FORECASTS FOR SOUTHWEST IDAHO/SOUTHEAST OREGON
NATIONAL WEATHER SERVICE BOISE ID
230 AM MDT MON MAY 18 2026
SPOT TEMPERATURES ARE FOR TODAY, TONIGHT, AND TUESDAY.
IDZ011-181600-
WEST CENTRAL MOUNTAINS-
230 AM MDT MON MAY 18 2026
TODAY
SUNNY. PATCHY FOG THIS MORNING. A SLIGHT CHANCE OF SNOW
SHOWERS THIS AFTERNOON. CHANCE OF SNOW 20 PERCENT. HIGHS 49 TO
63.
TONIGHT
DECREASING CLOUDS. PATCHY FOG AFTER MIDNIGHT. LOWS
27 TO 37.
TUESDAY
PATCHY FOG IN THE MORNING. SUNNY. HIGHS 52 TO 66.
TUESDAY NIGHT
DECREASING CLOUDS. LOWS 32 TO 43.
WEDNESDAY
MOSTLY SUNNY. HIGHS 54 TO 69.
WEDNESDAY NIGHT
PARTLY CLOUDY. AREAS OF FOG AFTER MIDNIGHT.
LOWS 33 TO 43.
THURSDAY
AREAS OF FOG IN THE MORNING. SUNNY. HIGHS 59 TO 73.
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 36 TO 47.
FRIDAY THROUGH SATURDAY
MOSTLY CLEAR. HIGHS 62 TO 77. LOWS
38 TO 48.
SATURDAY NIGHT
INCREASING CLOUDS. LOWS 39 TO 49.
SUNDAY
SUNNY. HIGHS 65 TO 79.
TEMPERATURE
MCCALL 56 27 60
=
IDZ013-181600-
BOISE MOUNTAINS-
230 AM MDT MON MAY 18 2026
TODAY
SUNNY. HIGHS 50 TO 65.
TONIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING. LOWS
25 TO 40.
TUESDAY
SUNNY. HIGHS 53 TO 67.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 28 TO 43.
WEDNESDAY
MOSTLY SUNNY. HIGHS 56 TO 71.
WEDNESDAY NIGHT AND THURSDAY
MOSTLY CLEAR. PATCHY FOG THROUGH
THE DAY. LOWS 29 TO 44. HIGHS 62 TO 77.
THURSDAY NIGHT
INCREASING CLOUDS. LOWS 33 TO 48.
FRIDAY THROUGH SUNDAY
MOSTLY CLEAR. HIGHS 67 TO 82. LOWS 35 TO
50.
TEMPERATURE
IDAHO CITY 64 28 66
=
IDZ028-181600-
CAMAS PRAIRIE-
230 AM MDT MON MAY 18 2026
TODAY
SUNNY. HIGHS 56 TO 61. NORTH WINDS 10 TO 15 MPH. GUSTS
TO 25 MPH THIS AFTERNOON.
TONIGHT
MOSTLY CLOUDY IN THE EVENING, THEN CLEARING. LOWS
25 TO 30. NORTHWEST WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH IN
THE EVENING, BECOMING LIGHT AFTER MIDNIGHT.
TUESDAY
MOSTLY SUNNY. HIGHS 59 TO 64. LIGHT WINDS IN THE
MORNING, BECOMING SOUTHWEST 10 TO 15 MPH IN THE AFTERNOON.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 28 TO 33. WEST WINDS 10 TO
15 MPH IN THE EVENING, BECOMING LIGHT AFTER MIDNIGHT.
WEDNESDAY
MOSTLY SUNNY. HIGHS 63 TO 68. BREEZY. LIGHT WINDS IN
THE MORNING, BECOMING WEST 10 TO 20 MPH IN THE AFTERNOON.
WEDNESDAY NIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING.
LOWS 33 TO 38. BREEZY.
THURSDAY
SUNNY. HIGHS 68 TO 73.
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 35 TO 40.
FRIDAY THROUGH SUNDAY
MOSTLY CLEAR. HIGHS 71 TO 81. LOWS 36 TO
43. BREEZY.
TEMPERATURE
FAIRFIELD 59 25 62
=
IDZ033-181600-
UPPER WEISER RIVER-
230 AM MDT MON MAY 18 2026
TODAY
SUNNY. HIGHS 61 TO 67. NORTH WINDS 10 TO 15 MPH. GUSTS
TO 25 MPH THIS AFTERNOON.
TONIGHT
PARTLY CLOUDY. LOWS 36 TO 41. NORTH WINDS 10 TO
15 MPH. GUSTS TO 25 MPH IN THE EVENING.
TUESDAY
SUNNY. HIGHS 64 TO 71. LIGHT WINDS.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 42 TO 47. LIGHT WINDS.
WEDNESDAY
MOSTLY SUNNY. HIGHS 68 TO 74. LIGHT WINDS.
WEDNESDAY NIGHT AND THURSDAY
MOSTLY CLEAR. LOWS 42 TO 47.
HIGHS 72 TO 79.
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 45 TO 50.
FRIDAY THROUGH SATURDAY
MOSTLY CLEAR. HIGHS 74 TO 84. LOWS
46 TO 51.
SATURDAY NIGHT
INCREASING CLOUDS. LOWS 47 TO 52.
SUNDAY
SUNNY. HIGHS 78 TO 84.
TEMPERATURE
COUNCIL 67 37 70
CAMBRIDGE 67 37 71
=
ORZ064-181600-
OREGON LOWER TREASURE VALLEY-
230 AM MDT MON MAY 18 2026 /130 AM PDT MON MAY 18 2026/
TODAY
SUNNY. HIGHS 67 TO 72. NORTH WINDS 10 TO 15 MPH WITH
GUSTS TO 25 MPH.
TONIGHT
DECREASING CLOUDS. LOWS 39 TO 44. NORTHWEST WINDS
10 TO 15 MPH. GUSTS TO 25 MPH IN THE EVENING.
TUESDAY
SUNNY. HIGHS 71 TO 76. LIGHT WINDS.
TUESDAY NIGHT
INCREASING CLOUDS. LOWS 45 TO 50. LIGHT WINDS.
WEDNESDAY
MOSTLY SUNNY. HIGHS 74 TO 79. LIGHT WINDS.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 46 TO 51.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 77 TO 84.
LOWS 49 TO 54.
SATURDAY
SUNNY. HIGHS 83 TO 88.
SATURDAY NIGHT
INCREASING CLOUDS. LOWS 51 TO 56.
SUNDAY
SUNNY. HIGHS 83 TO 88.
TEMPERATURE
ONTARIO 71 39 74
=
IDZ012-181600-
LOWER TREASURE VALLEY-
230 AM MDT MON MAY 18 2026
TODAY
SUNNY. HIGHS 66 TO 71. BREEZY. NORTHWEST WINDS 10 TO
20 MPH WITH GUSTS TO 30 MPH.
TONIGHT
DECREASING CLOUDS. LOWS 37 TO 42. NORTHWEST WINDS
10 TO 15 MPH. GUSTS TO 25 MPH IN THE EVENING.
TUESDAY
SUNNY. HIGHS 70 TO 75. LIGHT WINDS.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 43 TO 48. EAST WINDS UP TO
10 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 73 TO 78. LIGHT WINDS IN THE
MORNING, BECOMING NORTHWEST UP TO 10 MPH IN THE AFTERNOON.
WEDNESDAY NIGHT THROUGH SUNDAY
MOSTLY CLEAR. LOWS 45 TO 55.
HIGHS 77 TO 87.
TEMPERATURE
CALDWELL 69 39 72
=
IDZ014-181600-
UPPER TREASURE VALLEY-
230 AM MDT MON MAY 18 2026
TODAY
SUNNY. PATCHY BLOWING DUST. HIGHS 65 TO 70. WINDY.
NORTHWEST WINDS 15 TO 25 MPH WITH GUSTS TO 40 MPH.
TONIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING. LOWS
35 TO 40. BREEZY. NORTHWEST WINDS 10 TO 20 MPH WITH GUSTS TO
30 MPH IN THE EVENING, DECREASING TO AROUND 10 MPH AFTER
MIDNIGHT.
TUESDAY
SUNNY. HIGHS 69 TO 74. NORTHWEST WINDS UP TO 10 MPH.
GUSTS TO 20 MPH IN THE AFTERNOON.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 39 TO 45. NORTH WINDS AROUND
10 MPH WITH GUSTS TO 20 MPH IN THE EVENING, BECOMING LIGHT AFTER
MIDNIGHT.
WEDNESDAY
MOSTLY SUNNY. HIGHS 73 TO 78. LIGHT WINDS IN THE
MORNING, BECOMING NORTHWEST AROUND 10 MPH IN THE AFTERNOON. GUSTS
TO 20 MPH.
WEDNESDAY NIGHT
DECREASING CLOUDS. LOWS 43 TO 48.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 76 TO 84.
LOWS 45 TO 50.
SATURDAY THROUGH SUNDAY
MOSTLY CLEAR. HIGHS 84 TO 89. LOWS
48 TO 53.
TEMPERATURE
BOISE 68 39 71
MOUNTAIN HOME 68 36 72
=
IDZ016-181600-
WESTERN MAGIC VALLEY-
230 AM MDT MON MAY 18 2026
..FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MDT MONDAY
TODAY
PATCHY FROST THIS MORNING. SUNNY. HIGHS 60 TO 65. WEST
WINDS 10 TO 15 MPH WITH GUSTS TO 25 MPH.
TONIGHT
PARTLY CLOUDY. LOWS 33 TO 38. WEST WINDS 10 TO 15 MPH
WITH GUSTS TO 25 MPH IN THE EVENING, SHIFTING TO SOUTHEAST AFTER
MIDNIGHT.
TUESDAY
SUNNY. HIGHS 65 TO 70. SOUTH WINDS AROUND 10 MPH IN
THE MORNING, SHIFTING TO WEST IN THE AFTERNOON. GUSTS TO 20 MPH.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 36 TO 42. WEST WINDS AROUND
10 MPH IN THE EVENING, SHIFTING TO SOUTHEAST AFTER MIDNIGHT.
GUSTS TO 20 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 69 TO 75. SOUTHEAST WINDS UP TO
10 MPH IN THE MORNING, SHIFTING TO WEST IN THE AFTERNOON.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 42 TO 47.
THURSDAY AND THURSDAY NIGHT
MOSTLY CLEAR. HIGHS 72 TO 77. LOWS
43 TO 48.
FRIDAY
MOSTLY SUNNY. HIGHS 76 TO 81. BREEZY.
FRIDAY NIGHT THROUGH SUNDAY
MOSTLY CLEAR. LOWS 44 TO 51. HIGHS
80 TO 87.
TEMPERATURE
JEROME 61 35 65
TWIN FALLS 61 38 66
=
IDZ029-181600-
OWYHEE MOUNTAINS-
230 AM MDT MON MAY 18 2026
TODAY
PATCHY BLOWING DUST THIS MORNING. SUNNY. HIGHS 56 TO 61.
BREEZY.
TONIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING. LOWS
31 TO 41.
TUESDAY
SUNNY. HIGHS 62 TO 67.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 39 TO 46.
WEDNESDAY
MOSTLY SUNNY. HIGHS 66 TO 71.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 36 TO 46.
THURSDAY THROUGH FRIDAY NIGHT
MOSTLY CLEAR. HIGHS 69 TO 77.
LOWS 43 TO 53.
SATURDAY
SUNNY. HIGHS 76 TO 81.
SATURDAY NIGHT
INCREASING CLOUDS. LOWS 45 TO 54.
SUNDAY
SUNNY. HIGHS 76 TO 81.
=
IDZ015-181600-
SOUTHWEST HIGHLANDS-
230 AM MDT MON MAY 18 2026
TODAY
PATCHY BLOWING DUST THIS MORNING. SUNNY. HIGHS 55 TO 63.
WINDY. NORTH WINDS AROUND 25 MPH THIS AFTERNOON. GUSTS TO 35 MPH.
TONIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING. LOWS
28 TO 36.
TUESDAY
SUNNY. HIGHS 61 TO 68.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 35 TO 41.
WEDNESDAY
MOSTLY SUNNY. HIGHS 67 TO 74.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 38 TO 44.
THURSDAY THROUGH FRIDAY
MOSTLY CLEAR. HIGHS 70 TO 80. LOWS
41 TO 46.
FRIDAY NIGHT THROUGH SATURDAY NIGHT
PARTLY CLOUDY. LOWS 42 TO
50. HIGHS 78 TO 85.
SUNDAY
SUNNY. HIGHS 79 TO 85.
=
IDZ030-181600-
SOUTHERN TWIN FALLS COUNTY-
230 AM MDT MON MAY 18 2026
TODAY
SUNNY. HIGHS 55 TO 61.
TONIGHT
PARTLY CLOUDY. LOWS 31 TO 37.
TUESDAY
SUNNY. HIGHS 62 TO 67.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 36 TO 41.
WEDNESDAY
MOSTLY SUNNY. HIGHS 68 TO 73.
WEDNESDAY NIGHT
DECREASING CLOUDS. LOWS 41 TO 46.
THURSDAY AND THURSDAY NIGHT
MOSTLY CLEAR. HIGHS 71 TO 76. LOWS
43 TO 48.
FRIDAY
MOSTLY SUNNY. HIGHS 74 TO 79.
FRIDAY NIGHT
MOSTLY CLEAR. LOWS 45 TO 50.
SATURDAY AND SATURDAY NIGHT
PARTLY CLOUDY. HIGHS 79 TO 84.
LOWS 46 TO 51.
SUNDAY
SUNNY. HIGHS 80 TO 85.
=
ORZ062-181600-
BAKER COUNTY-
130 AM PDT MON MAY 18 2026
TODAY
MOSTLY SUNNY. PATCHY FOG THIS MORNING. A SLIGHT CHANCE
OF RAIN SHOWERS THIS AFTERNOON. CHANCE OF RAIN 20 PERCENT. HIGHS
58 TO 66. BREEZY. NORTHWEST WINDS 10 TO 20 MPH. GUSTS TO 30 MPH
THIS AFTERNOON.
TONIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING. PATCHY
FOG AFTER MIDNIGHT. LOWS 29 TO 39. NORTH WINDS 10 TO 15 MPH WITH
GUSTS TO 30 MPH IN THE EVENING, BECOMING LIGHT AFTER MIDNIGHT.
TUESDAY
PATCHY FOG IN THE MORNING. SUNNY. HIGHS 63 TO 70.
LIGHT WINDS.
TUESDAY NIGHT
PARTLY CLOUDY. LOWS 36 TO 46. NORTHWEST WINDS UP
TO 10 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 66 TO 73. NORTHWEST WINDS UP TO
10 MPH.
WEDNESDAY NIGHT
PARTLY CLOUDY. PATCHY FOG AFTER MIDNIGHT. LOWS
36 TO 46.
THURSDAY
PATCHY FOG IN THE MORNING. SUNNY. HIGHS 70 TO 78.
THURSDAY NIGHT
PARTLY CLOUDY. LOWS 40 TO 50.
FRIDAY THROUGH SATURDAY
MOSTLY CLEAR. HIGHS 73 TO 83. LOWS
41 TO 51.
SATURDAY NIGHT
PARTLY CLOUDY. LOWS 42 TO 52.
SUNDAY
SUNNY. HIGHS 75 TO 83.
TEMPERATURE
BAKER CITY 64 30 67
=
ORZ061-181600-
HARNEY COUNTY-
130 AM PDT MON MAY 18 2026
TODAY
MOSTLY SUNNY. HIGHS 59 TO 64. NORTHWEST WINDS UP TO
10 MPH WITH GUSTS TO 20 MPH.
TONIGHT
PARTLY CLOUDY IN THE EVENING, THEN CLEARING. LOWS
28 TO 36. NORTH WINDS UP TO 10 MPH. GUSTS TO 20 MPH IN THE
EVENING.
TUESDAY
SUNNY. HIGHS 63 TO 69. WEST WINDS UP TO 10 MPH.
TUESDAY NIGHT
INCREASING CLOUDS. LOWS 34 TO 42. NORTHWEST
WINDS UP TO 10 MPH.
WEDNESDAY
MOSTLY SUNNY. HIGHS 69 TO 74. WEST WINDS UP TO
10 MPH.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 34 TO 43.
THURSDAY THROUGH SUNDAY
MOSTLY CLEAR. HIGHS 72 TO 82. LOWS
39 TO 49.
TEMPERATURE
BURNS 64 29 69
=
ORZ063-181600-
MALHEUR COUNTY-
230 AM MDT MON MAY 18 2026 /130 AM PDT MON MAY 18 2026/
TODAY
MOSTLY SUNNY. HIGHS 59 TO 67. NORTH WINDS 10 TO 15 MPH
WITH GUSTS TO 25 MPH.
TONIGHT
MOSTLY CLOUDY IN THE EVENING, THEN CLEARING. LOWS
31 TO 41. NORTHWEST WINDS 10 TO 15 MPH. GUSTS TO 25 MPH IN THE
EVENING.
TUESDAY
SUNNY. HIGHS 65 TO 72. WEST WINDS UP TO 10 MPH.
TUESDAY NIGHT
MOSTLY CLEAR. LOWS 38 TO 47. NORTH WINDS UP TO
10 MPH IN THE EVENING, BECOMING LIGHT AFTER MIDNIGHT.
WEDNESDAY
MOSTLY SUNNY. HIGHS 70 TO 76. NORTHWEST WINDS UP TO
10 MPH.
WEDNESDAY NIGHT
PARTLY CLOUDY. LOWS 38 TO 48. BREEZY.
THURSDAY THROUGH SATURDAY
MOSTLY CLEAR. HIGHS 76 TO 86. LOWS
42 TO 52.
SATURDAY NIGHT
PARTLY CLOUDY. LOWS 44 TO 53.
SUNDAY
SUNNY. HIGHS 80 TO 87.
=
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