National Weather Service Forecast for: Lewistown MT
Issued by: National Weather Service Great Falls, MT
Updated: 9:41 pm MST Feb 1, 2026
 
Tonight

Tonight: A chance of rain and snow, mainly after 5am. Mostly cloudy, with a low around 33. West wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Partly Cloudy
then Chance
Rain/Snow
 Monday

Monday: A 30 percent chance of snow before 7am. Partly sunny, then gradually becoming sunny, with a high near 48. Breezy, with a west wind 13 to 22 mph, with gusts as high as 31 mph. Little or no snow accumulation expected.
Chance Snow
and Breezy
then Sunny
 Monday
Night
Monday Night: Mostly cloudy, with a low around 29. West southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Mostly Cloudy

 Tuesday

Tuesday: Mostly sunny, with a high near 48. Northwest wind 8 to 16 mph, with gusts as high as 25 mph.
Mostly Sunny

 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 29. Northwest wind 5 to 7 mph becoming south after midnight.
Partly Cloudy

 Wednesday

Wednesday: Partly sunny, with a high near 62. South wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Partly Sunny

 Wednesday
Night
Wednesday Night: Mostly cloudy, with a low around 40. Southwest wind 6 to 9 mph, with gusts as high as 18 mph.
Mostly Cloudy

 Thursday

Thursday: Sunny, with a high near 64. Southwest wind around 6 mph becoming west northwest in the afternoon.
Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 30.
Mostly Clear
Lo 33 °F Hi 48 °F Lo 29 °F Hi 48 °F Lo 29 °F Hi 62 °F Lo 40 °F Hi 64 °F Lo 30 °F

 

Tonight
 
 A chance of rain and snow, mainly after 5am. Mostly cloudy, with a low around 33. West wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 30%. Little or no snow accumulation expected.
Monday
 
 A 30 percent chance of snow before 7am. Partly sunny, then gradually becoming sunny, with a high near 48. Breezy, with a west wind 13 to 22 mph, with gusts as high as 31 mph. Little or no snow accumulation expected.
Monday Night
 
 Mostly cloudy, with a low around 29. West southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Tuesday
 
 Mostly sunny, with a high near 48. Northwest wind 8 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
 
 Partly cloudy, with a low around 29. Northwest wind 5 to 7 mph becoming south after midnight.
Wednesday
 
 Partly sunny, with a high near 62. South wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
Wednesday Night
 
 Mostly cloudy, with a low around 40. Southwest wind 6 to 9 mph, with gusts as high as 18 mph.
Thursday
 
 Sunny, with a high near 64. Southwest wind around 6 mph becoming west northwest in the afternoon.
Thursday Night
 
 Mostly clear, with a low around 30.
Friday
 
 Sunny, with a high near 60.
Friday Night
 
 Partly cloudy, with a low around 32.
Saturday
 
 Mostly sunny, with a high near 55.
Saturday Night
 
 Mostly cloudy, with a low around 32.
Sunday
 
 Partly sunny, with a high near 55.

 

Forecast from NOAA-NWS for Lewistown MT.