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

Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

Helena Regional Airport (KHLN)

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

Clear

72°F

22°C

Humidity 37%
Wind Speed W 8 MPH
Barometer 30.09 in (1018.96 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 17 Aug 11:05 PM MDT
Extended Forecast for

Helena MT

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 58. Light west wind.

    Low: 58 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Calm wind becoming northwest 5 to 8 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 83 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 56. Southwest wind 5 to 7 mph, with gusts as high as 18 mph.

    Low: 56 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 86. Light southwest wind becoming west northwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. West northwest wind 5 to 8 mph becoming light and variable. Winds could gust as high as 18 mph.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 89. Calm wind becoming north northwest 5 to 7 mph in the afternoon.

    High: 89 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 60. North northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 88. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    Showers then
    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 58. Light west wind.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Calm wind becoming northwest 5 to 8 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 56. Southwest wind 5 to 7 mph, with gusts as high as 18 mph.
Wednesday
Sunny, with a high near 86. Light southwest wind becoming west northwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 57. West northwest wind 5 to 8 mph becoming light and variable. Winds could gust as high as 18 mph.
Thursday
Sunny, with a high near 89. Calm wind becoming north northwest 5 to 7 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 60. North northwest wind 5 to 8 mph becoming calm after midnight.
Friday
Mostly sunny, with a high near 88. Calm wind becoming north northeast around 5 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 62.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 86.
Saturday Night
A chance of showers. Partly cloudy, with a low around 59.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 57.
Monday
Sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Helena MT
 46.58°N 112.04°W (Elev. 4413 ft)
Last Update:
12:32 pm MDT Aug 17, 2026
Forecast Valid:
11pm MDT Aug 17, 2026-6pm MDT Aug 24, 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