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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Helena Regional Airport (KHLN)

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

Overcast

60°F

16°C

Humidity 80%
Wind Speed SSE 9 MPH
Barometer 30.15 in (1021.0 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 18 Sep 10:53 PM MDT
Extended Forecast for

East Helena MT

Flood Watch until September 19, 06:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until September 19, 06:00pm

    NOW until 6:00pm Sat

    Flood Watch

  • Tonight

    Low: 51 °F

    Showers

  • Saturday

    Saturday: Rain and possibly a thunderstorm before 1pm, then showers likely and possibly a thunderstorm between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. High near 61. West northwest wind 3 to 6 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 61 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of rain before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 47. South southwest wind around 5 mph becoming calm in the evening.

    Low: 47 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Sunday

    Sunday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 72. Light and variable wind.

    High: 72 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 47. South wind 3 to 5 mph.

    Low: 47 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 77. Calm wind becoming south southeast 5 to 7 mph in the afternoon.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 48. West northwest wind 5 to 7 mph becoming light and variable after midnight.

    Low: 48 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. Calm wind becoming east around 5 mph in the afternoon.

    High: 77 °F

    Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Low around 51. Light and variable wind becoming west northwest around 6 mph after midnight. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Rain and possibly a thunderstorm before 1pm, then showers likely and possibly a thunderstorm between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. High near 61. West northwest wind 3 to 6 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
A 20 percent chance of rain before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 47. South southwest wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 72. Light and variable wind.
Sunday Night
Mostly clear, with a low around 47. South wind 3 to 5 mph.
Monday
Sunny, with a high near 77. Calm wind becoming south southeast 5 to 7 mph in the afternoon.
Monday Night
Mostly clear, with a low around 48. West northwest wind 5 to 7 mph becoming light and variable after midnight.
Tuesday
Sunny, with a high near 77. Calm wind becoming east around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 49.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 79.
Thursday Night
Mostly clear, with a low around 49.
Friday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
East Helena MT
 46.59°N 111.92°W (Elev. 3891 ft)
Last Update:
10:21 pm MDT Sep 18, 2026
Forecast Valid:
11pm MDT Sep 18, 2026-6pm MDT Sep 25, 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