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

Excessive Rainfall and Significant Flooding in the Upper Midwest This Weekend

Heavy to excessive rainfall is expected over the weekend across eastern Iowa, northern Missouri, northwest Illinois and southern Wisconsin. Numerous flash floods, some with significant impacts, are expected in these areas. Heaviest rainfall will occur overnight Saturday and Sunday, so be sure to have multiple ways to receive warnings. Read More >

Current conditions at

Comertown Turn-Off MT-5 MP 13.4 (MTCOM)

Lat: 48.81°NLon: 104.2529°WElev: 2359.0ft.

NA

58°F

14°C

Humidity 83%
Wind Speed WNW 19 MPH
Barometer NA
Dewpoint 53°F (12°C)
Visibility NA
Last update 08 Aug 04:45 PM MDT
Extended Forecast for

Westby MT

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely after 3am. Mostly cloudy, with a low around 55. West southwest wind 16 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    Low: 55 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before 3pm. Mostly cloudy, with a high near 67. Breezy, with a west wind 20 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 70%.

    High: 67 °F

    Showers
    Likely and
    Breezy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 53. Breezy, with a west wind 15 to 24 mph, with gusts as high as 36 mph.

    Low: 53 °F

    Mostly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Sunday

    Sunday: Sunny, with a high near 77. West wind 14 to 20 mph, with gusts as high as 29 mph.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 56. West wind 8 to 15 mph, with gusts as high as 24 mph.

    Low: 56 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 78. West wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. Northwest wind 6 to 14 mph becoming west southwest after midnight. Winds could gust as high as 23 mph.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79. South southwest wind 6 to 10 mph becoming west in the afternoon. Winds could gust as high as 18 mph.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Partly cloudy, with a low around 57. North northwest wind around 10 mph becoming southeast after midnight.

    Low: 57 °F

    Mostly Clear
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely after 3am. Mostly cloudy, with a low around 55. West southwest wind 16 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Saturday
Showers and thunderstorms likely, mainly before 3pm. Mostly cloudy, with a high near 67. Breezy, with a west wind 20 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 70%.
Saturday Night
Mostly cloudy, with a low around 53. Breezy, with a west wind 15 to 24 mph, with gusts as high as 36 mph.
Sunday
Sunny, with a high near 77. West wind 14 to 20 mph, with gusts as high as 29 mph.
Sunday Night
Mostly cloudy, with a low around 56. West wind 8 to 15 mph, with gusts as high as 24 mph.
Monday
Mostly sunny, with a high near 78. West wind 10 to 17 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 55. Northwest wind 6 to 14 mph becoming west southwest after midnight. Winds could gust as high as 23 mph.
Tuesday
Mostly sunny, with a high near 79. South southwest wind 6 to 10 mph becoming west in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Partly cloudy, with a low around 57. North northwest wind around 10 mph becoming southeast after midnight.
Wednesday
Mostly sunny, with a high near 81. South wind 11 to 15 mph, with gusts as high as 23 mph.
Wednesday Night
Mostly clear, with a low around 56. East southeast wind 10 to 14 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 80.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 56.
Friday
A slight chance of showers. Partly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Westby MT
 48.87°N 104.05°W (Elev. 1991 ft)
Last Update:
1:48 pm MDT Aug 8, 2025
Forecast Valid:
6pm MDT Aug 8, 2025-6pm MDT Aug 15, 2025
 
Forecast Discussion
 
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Additional Resources

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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