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

Tonight: Mostly clear, with a low around 46. North wind 8 to 13 mph becoming light and variable after midnight. Winds could gust as high as 25 mph.
Mostly Clear

 Juneteenth

Juneteenth: Mostly sunny, with a high near 78. Calm wind becoming east northeast 5 to 7 mph in the afternoon.
Mostly Sunny

 Friday
Night
Friday Night: Partly cloudy, with a low around 50. North northeast wind around 6 mph becoming calm after midnight.
Partly Cloudy

 Saturday

Saturday: A chance of showers between noon and 3pm, then a chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 30%.
Partly Sunny
then Chance
Showers
 Saturday
Night
Saturday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 52. West wind around 8 mph. Chance of precipitation is 30%.
Chance
Showers then
Partly Cloudy
 Sunday

Sunday: Sunny, with a high near 76. Northwest wind 5 to 10 mph, with gusts as high as 21 mph.
Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 47. North northwest wind 6 to 16 mph, with gusts as high as 31 mph.
Partly Cloudy

 Monday

Monday: Mostly sunny, with a high near 72. Light northwest wind becoming north 5 to 9 mph in the morning. Winds could gust as high as 21 mph.
Mostly Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 46.
Mostly Clear
Lo 46 °F Hi 78 °F Lo 50 °F Hi 83 °F Lo 52 °F Hi 76 °F Lo 47 °F Hi 72 °F Lo 46 °F

 

Tonight
 
 Mostly clear, with a low around 46. North wind 8 to 13 mph becoming light and variable after midnight. Winds could gust as high as 25 mph.
Juneteenth
 
 Mostly sunny, with a high near 78. Calm wind becoming east northeast 5 to 7 mph in the afternoon.
Friday Night
 
 Partly cloudy, with a low around 50. North northeast wind around 6 mph becoming calm after midnight.
Saturday
 
 A chance of showers between noon and 3pm, then a chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 83. Calm wind becoming west 5 to 7 mph in the afternoon. Chance of precipitation is 30%.
Saturday Night
 
 A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 52. West wind around 8 mph. Chance of precipitation is 30%.
Sunday
 
 Sunny, with a high near 76. Northwest wind 5 to 10 mph, with gusts as high as 21 mph.
Sunday Night
 
 Partly cloudy, with a low around 47. North northwest wind 6 to 16 mph, with gusts as high as 31 mph.
Monday
 
 Mostly sunny, with a high near 72. Light northwest wind becoming north 5 to 9 mph in the morning. Winds could gust as high as 21 mph.
Monday Night
 
 Mostly clear, with a low around 46.
Tuesday
 
 Sunny, with a high near 82.
Tuesday Night
 
 Mostly clear, with a low around 51.
Wednesday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Wednesday Night
 
 Partly cloudy, with a low around 53.
Thursday
 
 Sunny, with a high near 88.

 

Forecast from NOAA-NWS for Helena MT.