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

Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Current conditions at

Helena Regional Airport (KHLN)

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

Clear

84°F

29°C

Humidity 25%
Wind Speed N 3 MPH
Barometer 29.91 in (1012.87 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 15 Aug 02:20 PM MDT
Extended Forecast for

Helena MT

  • This Afternoon

    This Afternoon: Sunny, with a high near 88. West wind around 10 mph, with gusts as high as 22 mph.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Widespread haze between 8pm and 9pm. Mostly clear, with a low around 60. West northwest wind 5 to 9 mph becoming light west after midnight. Winds could gust as high as 21 mph.

    Low: 60 °F

    Haze then
    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after 5pm. Increasing clouds, with a high near 89. Light and variable wind becoming northeast 5 to 10 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 89 °F

    Sunny then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Cloudy, then gradually becoming partly cloudy, with a low around 59. West southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 20%.

    Low: 59 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms between noon and 3pm, then a chance of showers after 3pm. Partly sunny, with a high near 85. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Chance of precipitation is 40%.

    High: 85 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 58. West wind 5 to 7 mph becoming light and variable after midnight.

    Low: 58 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 87. Calm wind becoming west 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 87 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60. West northwest wind around 6 mph becoming calm after midnight.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 88. West wind around 10 mph, with gusts as high as 22 mph.
Tonight
Widespread haze between 8pm and 9pm. Mostly clear, with a low around 60. West northwest wind 5 to 9 mph becoming light west after midnight. Winds could gust as high as 21 mph.
Saturday
A 30 percent chance of showers and thunderstorms after 5pm. Increasing clouds, with a high near 89. Light and variable wind becoming northeast 5 to 10 mph in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Cloudy, then gradually becoming partly cloudy, with a low around 59. West southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 22 mph. Chance of precipitation is 20%.
Sunday
A chance of showers and thunderstorms between noon and 3pm, then a chance of showers after 3pm. Partly sunny, with a high near 85. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Chance of precipitation is 40%.
Sunday Night
A 20 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 58. West wind 5 to 7 mph becoming light and variable after midnight.
Monday
Mostly sunny, with a high near 87. Calm wind becoming west 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph.
Monday Night
Mostly clear, with a low around 60. West northwest wind around 6 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Sunny, with a high near 91.
Wednesday Night
Mostly clear, with a low around 62.
Thursday
Sunny, with a high near 86.
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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:
2:22 pm MDT Aug 15, 2025
Forecast Valid:
2pm MDT Aug 15, 2025-6pm MDT Aug 21, 2025
 
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