National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heavy Rainfall and Severe Thunderstorm Threats; Heat Risk Expands; Monitoring the Tropics

Flash flooding risks continue for portions of the Four Corners and Great Basin through today. Severe thunderstorms are outlooked from the eastern Great Lakes, southern New England into the mid-Atlantic through Tuesday. Heat risk increases and expands across the center of the nation and across the Ohio Valley and mid-Atlantic this week. Continue to closely monitor tropical development in the Gulf. Read More >

Current conditions at

Helena Regional Airport (KHLN)

Lat: 46.60445°NLon: 111.9892°WElev: 3874.0ft.

Clear

79°F

26°C

Humidity 19%
Wind Speed E 13 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 31 Aug 06:00 PM MDT
Extended Forecast for

Helena MT

  • Tonight

    Tonight: Increasing clouds, with a low around 53. East wind 5 to 7 mph becoming calm in the evening.

    Low: 53 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 85. Calm wind becoming east 5 to 8 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 85 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 3am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 56. South southwest wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 60%.

    Low: 56 °F

    Showers
    Likely then
    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 78. Light south southeast wind becoming south southwest 8 to 13 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    High: 78 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 53. South southwest wind 5 to 10 mph, with gusts as high as 22 mph.

    Low: 53 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 76. Light south wind becoming west southwest 8 to 13 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 76 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 51. West wind 5 to 10 mph becoming light west southwest after midnight. Winds could gust as high as 22 mph.

    Low: 51 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76. Calm wind becoming northwest 5 to 7 mph in the afternoon.

    High: 76 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 53. East wind 5 to 7 mph becoming calm in the evening.
Tuesday
Increasing clouds, with a high near 85. Calm wind becoming east 5 to 8 mph in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
Showers likely and possibly a thunderstorm before 3am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 56. South southwest wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 60%.
Wednesday
A slight chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 78. Light south southeast wind becoming south southwest 8 to 13 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Wednesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 53. South southwest wind 5 to 10 mph, with gusts as high as 22 mph.
Thursday
Mostly sunny, with a high near 76. Light south wind becoming west southwest 8 to 13 mph in the afternoon. Winds could gust as high as 25 mph.
Thursday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 51. West wind 5 to 10 mph becoming light west southwest after midnight. Winds could gust as high as 22 mph.
Friday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76. Calm wind becoming northwest 5 to 7 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Saturday
A slight chance of showers. Mostly sunny, with a high near 75.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 53.
Sunday
A chance of showers. Partly sunny, with a high near 74.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 53.
Labor Day
A chance of showers. Partly sunny, with a high near 75.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Helena MT
 46.58°N 112.04°W (Elev. 4413 ft)
Last Update:
4:57 pm MDT Aug 31, 2026
Forecast Valid:
6pm MDT Aug 31, 2026-6pm MDT Sep 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation