National Weather Service Forecast for: Great Falls MT
Issued by: National Weather Service Great Falls, MT
Updated: 3:43 am MDT Jun 22, 2026
 
Overnight

Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 48. North wind 3 to 5 mph.
Slight Chance
Showers

 Monday

Monday: A chance of showers, with thunderstorms also possible after 3pm. Partly sunny, with a high near 66. Light north northwest wind becoming north 5 to 9 mph in the morning. Chance of precipitation is 40%.
Chance
Showers

 Monday
Night
Monday Night: A 20 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 41. North northwest wind 5 to 9 mph becoming calm in the evening.
Slight Chance
Showers then
Mostly Clear
 Tuesday

Tuesday: Sunny, with a high near 71. Calm wind becoming north northeast 5 to 7 mph in the afternoon.
Sunny

 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 47. Northeast wind 5 to 8 mph becoming calm after midnight.
Mostly Cloudy

 Wednesday

Wednesday: Mostly sunny, with a high near 78. Calm wind becoming east northeast 5 to 8 mph in the afternoon.
Mostly Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 49. East northeast wind 5 to 10 mph becoming light and variable after midnight.
Partly Cloudy

 Thursday

Thursday: A slight chance of showers and thunderstorms after noon. Partly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.
Partly Sunny
then Slight
Chance
T-storms
 Thursday
Night
Thursday Night: Mostly cloudy, with a low around 53.
Mostly Cloudy
Lo 48 °F Hi 66 °F Lo 41 °F Hi 71 °F Lo 47 °F Hi 78 °F Lo 49 °F Hi 83 °F Lo 53 °F

 

Overnight
 
 A 20 percent chance of showers. Mostly cloudy, with a low around 48. North wind 3 to 5 mph.
Monday
 
 A chance of showers, with thunderstorms also possible after 3pm. Partly sunny, with a high near 66. Light north northwest wind becoming north 5 to 9 mph in the morning. Chance of precipitation is 40%.
Monday Night
 
 A 20 percent chance of showers before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 41. North northwest wind 5 to 9 mph becoming calm in the evening.
Tuesday
 
 Sunny, with a high near 71. Calm wind becoming north northeast 5 to 7 mph in the afternoon.
Tuesday Night
 
 Mostly cloudy, with a low around 47. Northeast wind 5 to 8 mph becoming calm after midnight.
Wednesday
 
 Mostly sunny, with a high near 78. Calm wind becoming east northeast 5 to 8 mph in the afternoon.
Wednesday Night
 
 Partly cloudy, with a low around 49. East northeast wind 5 to 10 mph becoming light and variable after midnight.
Thursday
 
 A slight chance of showers and thunderstorms after noon. Partly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
 
 Mostly cloudy, with a low around 53.
Friday
 
 A chance of showers and thunderstorms after noon. Partly sunny, with a high near 85.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Saturday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 72.
Saturday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 47.
Sunday
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 64. Breezy.

 

Forecast from NOAA-NWS for Great Falls MT.