National Weather Service Forecast for: Great Falls MT
Issued by: National Weather Service Great Falls, MT
Updated: 7:41 pm MDT Jun 18, 2026
 
Tonight

Tonight: Partly cloudy, with a low around 44. North northeast wind around 6 mph becoming calm in the evening.
Partly Cloudy

 Juneteenth

Juneteenth: Mostly sunny, with a high near 74. Light and variable wind becoming east northeast 6 to 11 mph in the morning. Winds could gust as high as 21 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly cloudy, with a low around 48. East northeast wind 8 to 13 mph becoming light and variable after midnight. Winds could gust as high as 22 mph.
Mostly Cloudy

 Saturday

Saturday: Mostly sunny, with a high near 84. Calm wind becoming east around 6 mph in the afternoon.
Mostly Sunny

 Saturday
Night
Saturday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 51. North northeast wind 6 to 9 mph becoming west southwest in the evening. Chance of precipitation is 30%.
Chance
Showers then
Mostly Cloudy
 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73. Northwest wind 5 to 9 mph.
Mostly Sunny
then Slight
Chance
T-storms
 Sunday
Night
Sunday Night: A 30 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 45. North wind 8 to 13 mph becoming light northwest after midnight. Winds could gust as high as 18 mph.
Chance
Showers then
Mostly Cloudy
 Monday

Monday: Mostly sunny, with a high near 70. Calm wind becoming north 5 to 7 mph in the afternoon.
Mostly Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 43.
Mostly Clear
Lo 44 °F Hi 74 °F Lo 48 °F Hi 84 °F Lo 51 °F Hi 73 °F Lo 45 °F Hi 70 °F Lo 43 °F

 

Tonight
 
 Partly cloudy, with a low around 44. North northeast wind around 6 mph becoming calm in the evening.
Juneteenth
 
 Mostly sunny, with a high near 74. Light and variable wind becoming east northeast 6 to 11 mph in the morning. Winds could gust as high as 21 mph.
Friday Night
 
 Mostly cloudy, with a low around 48. East northeast wind 8 to 13 mph becoming light and variable after midnight. Winds could gust as high as 22 mph.
Saturday
 
 Mostly sunny, with a high near 84. Calm wind becoming east around 6 mph in the afternoon.
Saturday Night
 
 A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 51. North northeast wind 6 to 9 mph becoming west southwest in the evening. Chance of precipitation is 30%.
Sunday
 
 A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 73. Northwest wind 5 to 9 mph.
Sunday Night
 
 A 30 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 45. North wind 8 to 13 mph becoming light northwest after midnight. Winds could gust as high as 18 mph.
Monday
 
 Mostly sunny, with a high near 70. Calm wind becoming north 5 to 7 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 43.
Tuesday
 
 Sunny, with a high near 79.
Tuesday Night
 
 Mostly clear, with a low around 49.
Wednesday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Wednesday Night
 
 Partly cloudy, with a low around 52.
Thursday
 
 Mostly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Great Falls MT.