National Weather Service Forecast for: Lewistown MT
Issued by: National Weather Service Great Falls, MT
Updated: 5:41 am MDT Jun 10, 2025
 
Today

Today: A 20 percent chance of showers and thunderstorms after 3pm.  Sunny, with a high near 82. Light and variable wind becoming north northeast around 6 mph in the afternoon.
Sunny then
Slight Chance
T-storms
Tonight

Tonight: A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 5am.  Mostly cloudy, with a low around 52. East southeast wind 5 to 7 mph.  Chance of precipitation is 40%.
Chance
T-storms then
Chance
Showers
Wednesday

Wednesday: A 50 percent chance of showers and thunderstorms after noon.  Partly sunny, with a high near 78. East southeast wind 5 to 8 mph becoming north northeast in the morning.
Partly Sunny
then Chance
T-storms
Wednesday
Night
Wednesday Night: Showers and possibly a thunderstorm.  Low around 51. East wind 5 to 8 mph becoming north northeast after midnight.  Chance of precipitation is 80%.
Showers

Thursday

Thursday: A chance of showers, then showers and possibly a thunderstorm after noon.  High near 67. Northeast wind 3 to 7 mph.  Chance of precipitation is 80%.
Chance
Showers then
Showers
Thursday
Night
Thursday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 48. East wind 5 to 8 mph.  Chance of precipitation is 40%.
Chance
T-storms then
Chance
Showers
Friday

Friday: A 50 percent chance of showers and thunderstorms after noon.  Partly sunny, with a high near 75. Southeast wind around 6 mph.
Partly Sunny
then Chance
T-storms
Friday
Night
Friday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers.  Mostly cloudy, with a low around 50. East southeast wind 5 to 8 mph becoming light and variable  after midnight.
Showers
Likely

Saturday

Saturday: A chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 77.
Sunny then
Chance
T-storms
Hi 82 °F Lo 52 °F Hi 78 °F Lo 51 °F Hi 67 °F Lo 48 °F Hi 75 °F Lo 50 °F Hi 77 °F

 

Today
 
A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 82. Light and variable wind becoming north northeast around 6 mph in the afternoon.
Tonight
 
A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 5am. Mostly cloudy, with a low around 52. East southeast wind 5 to 7 mph. Chance of precipitation is 40%.
Wednesday
 
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 78. East southeast wind 5 to 8 mph becoming north northeast in the morning.
Wednesday Night
 
Showers and possibly a thunderstorm. Low around 51. East wind 5 to 8 mph becoming north northeast after midnight. Chance of precipitation is 80%.
Thursday
 
A chance of showers, then showers and possibly a thunderstorm after noon. High near 67. Northeast wind 3 to 7 mph. Chance of precipitation is 80%.
Thursday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 48. East wind 5 to 8 mph. Chance of precipitation is 40%.
Friday
 
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 75. Southeast wind around 6 mph.
Friday Night
 
Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 50. East southeast wind 5 to 8 mph becoming light and variable after midnight.
Saturday
 
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 77.
Saturday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51.
Sunday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 75.
Sunday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 48.
Monday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 73.

 

Forecast from NOAA-NWS for Lewistown MT.