353
FPUS65 KTFX 182138
AFPTFX
CENTRAL AND SOUTHWEST MONTANA AREA FORECAST
NATIONAL WEATHER SERVICE GREAT FALLS MT
337 PM MDT FRI SEP 18 2026
MTZ301>314-316>318-191200-
CENTRAL MONTANA-
NATIONAL WEATHER SERVICE GREAT FALLS MT
337 PM MDT FRI SEP 18 2026
...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING FOR
LITTLE BELT AND HIGHWOOD MOUNTAINS...
TONIGHT
MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND SLIGHT
CHANCE OF THUNDERSTORMS IN THE EVENING. CHANCE OF RAIN AFTER
MIDNIGHT. SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL IN THE
EVENING. LOWS 50 TO 55...45 TO 50 IN THE MOUNTAINS.
SATURDAY
CLOUDY. CHANCE OF RAIN THROUGH THE DAY. HIGHS 60 TO
70...50 TO 60 IN THE MOUNTAINS.
SATURDAY NIGHT
MOSTLY CLOUDY. CHANCE OF RAIN THROUGH THE
NIGHT. LOWS 45 TO 50...40 TO 45 IN THE MOUNTAINS.
SUNDAY
MOSTLY CLEAR. HIGHS 65 TO 75.
MONDAY
MOSTLY CLEAR. LOWS 45 TO 50. HIGHS 70 TO 80.
TUESDAY
MOSTLY CLEAR. LOWS 45 TO 50. HIGHS 70 TO 80.
WEDNESDAY
MOSTLY CLEAR. LOWS 45 TO 55. HIGHS 70 TO 80.
MTZ315-319>330-191200-
SOUTHWEST MONTANA-
NATIONAL WEATHER SERVICE GREAT FALLS MT
337 PM MDT FRI SEP 18 2026
...FLOOD WATCH IN EFFECT THROUGH SATURDAY AFTERNOON FOR HELENA
VALLEY...MEAGHER COUNTY VALLEYS...CANYON FERRY AREA...GALLATIN
VALLEY...
...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY EVENING FOR BIG
BELT, BRIDGER AND CASTLE MOUNTAINS...ELKHORN AND BOULDER
MOUNTAINS...
...FLASH FLOOD WATCH IN EFFECT THROUGH SATURDAY AFTERNOON FOR
NORTHWEST BEAVERHEAD COUNTY...
TONIGHT
CHANCE OF THUNDERSTORMS IN THE EVENING. RAIN SHOWERS
THROUGH THE NIGHT. SLIGHT CHANCE OF THUNDERSTORMS AFTER MIDNIGHT.
SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL IN THE EVENING.
SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL AFTER MIDNIGHT.
LOWS 40 TO 50.
SATURDAY
CLOUDY. RAIN SHOWERS AND SLIGHT CHANCE OF
THUNDERSTORMS. SOME THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL.
HIGHS 55 TO 60...45 TO 55 IN THE MOUNTAINS.
SATURDAY NIGHT
MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE NIGHT. SLIGHT CHANCE
OF RAIN AFTER MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. SOME
THUNDERSTORMS MAY PRODUCE HEAVY RAINFALL. LOWS 40 TO 50...35 TO
45 IN THE MOUNTAINS.
SUNDAY
PARTLY CLOUDY. HIGHS 60 TO 70.
MONDAY
MOSTLY CLEAR. LOWS 40 TO 45. HIGHS 65 TO 75.
TUESDAY
PARTLY CLOUDY. LOWS 40 TO 50. HIGHS 65 TO 75.
WEDNESDAY
MOSTLY CLEAR. LOWS 40 TO 50. HIGHS 65 TO 75.
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