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

Karst US-191 MP 55.3 (MTKAR)

Lat: 45.34534°NLon: 111.17261°WElev: 5699.0ft.

unknown precip

42°F

6°C

Humidity 92%
Wind Speed S 0 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Last update 10 Aug 01:30 AM MDT
Extended Forecast for

4 Miles E Big Sky MT

  • Overnight

    Overnight: Partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 78. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 78 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 48. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 48 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 84. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50. North wind around 6 mph becoming calm in the evening.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 51. West wind 5 to 7 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 51 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 89. Light and variable wind becoming west 8 to 13 mph in the morning. Winds could gust as high as 26 mph.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 42. Calm wind.
Sunday
Mostly sunny, with a high near 78. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph.
Sunday Night
Mostly clear, with a low around 48. North northwest wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 84. Calm wind becoming northwest around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 50. North wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 88. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 51. West wind 5 to 7 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Wednesday
Sunny, with a high near 89. Light and variable wind becoming west 8 to 13 mph in the morning. Winds could gust as high as 26 mph.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Mostly sunny, with a high near 85.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Big Sky MT
 45.26°N 111.26°W (Elev. 5997 ft)
Last Update:
8:07 pm MDT Aug 9, 2025
Forecast Valid:
1am MDT Aug 10, 2025-6pm MDT Aug 16, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation