National Weather Service Forecast for: Hamilton MT
Issued by: National Weather Service Missoula, MT
Updated: 2:00 pm MDT Jun 18, 2026
 
Tonight

Tonight: Mostly clear, with a low around 46. North northwest wind around 6 mph becoming calm  in the evening.
Mostly Clear

Juneteenth

Juneteenth: Partly sunny, with a high near 84. Calm wind becoming north around 6 mph in the afternoon.
Partly Sunny

Friday
Night
Friday Night: Mostly cloudy, with a low around 53. North wind around 5 mph becoming calm  in the evening.
Mostly Cloudy

Saturday

Saturday: A 40 percent chance of showers after noon.  Partly sunny, with a high near 83. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 21 mph.
Mostly Sunny
then Chance
Showers
Saturday
Night
Saturday Night: Partly cloudy, with a low around 49. West wind 8 to 13 mph becoming light and variable  after midnight. Winds could gust as high as 26 mph.
Partly Cloudy

Sunday

Sunday: Sunny, with a high near 82.
Sunny

Sunday
Night
Sunday Night: Mostly clear, with a low around 47.
Mostly Clear

Monday

Monday: Sunny, with a high near 81.
Sunny

Monday
Night
Monday Night: Mostly clear, with a low around 48.
Mostly Clear

Lo 46 °F Hi 84 °F Lo 53 °F Hi 83 °F Lo 49 °F Hi 82 °F Lo 47 °F Hi 81 °F Lo 48 °F

 

Tonight
 
Mostly clear, with a low around 46. North northwest wind around 6 mph becoming calm in the evening.
Juneteenth
 
Partly sunny, with a high near 84. Calm wind becoming north around 6 mph in the afternoon.
Friday Night
 
Mostly cloudy, with a low around 53. North wind around 5 mph becoming calm in the evening.
Saturday
 
A 40 percent chance of showers after noon. Partly sunny, with a high near 83. Light and variable wind becoming west 5 to 10 mph in the afternoon. Winds could gust as high as 21 mph.
Saturday Night
 
Partly cloudy, with a low around 49. West wind 8 to 13 mph becoming light and variable after midnight. Winds could gust as high as 26 mph.
Sunday
 
Sunny, with a high near 82.
Sunday Night
 
Mostly clear, with a low around 47.
Monday
 
Sunny, with a high near 81.
Monday Night
 
Mostly clear, with a low around 48.
Tuesday
 
Sunny, with a high near 90.
Tuesday Night
 
Mostly clear, with a low around 53.
Wednesday
 
Sunny, with a high near 90.
Wednesday Night
 
Mostly clear, with a low around 54.
Thursday
 
Sunny, with a high near 88.

 

Forecast from NOAA-NWS for Hamilton MT.