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

Madison, Dane County Regional-Truax Field (KMSN)

Lat: 43.14°NLon: 89.35°WElev: 860ft.

Fair

10°F

-12°C

Humidity 76%
Wind Speed NW 6 mph
Barometer 30.02 in (1018.3 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill0°F (-18°C)
Last update 17 Mar 3:53 am CDT
Extended Forecast for

Sun Prairie WI

  • Today

    Today: Increasing clouds, with a high near 21. Wind chill values between -5 and -15. Northwest wind 5 to 10 mph becoming southwest in the afternoon.

    High: 21 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Snow, mainly after 10pm. Low around 16. South wind 5 to 10 mph. Chance of precipitation is 100%. New snow accumulation of around an inch possible.

    Low: 16 °F

    Snow

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 40. Southwest wind 5 to 10 mph.

    High: 40 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 32. Southwest wind around 5 mph.

    Low: 32 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Partly sunny, with a high near 43. South wind around 5 mph becoming north in the afternoon.

    High: 43 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 33. Northeast wind around 5 mph becoming south in the evening.

    Low: 33 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 48. Southwest wind 5 to 10 mph.

    High: 48 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 34. East wind around 5 mph becoming south after midnight.

    Low: 34 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 21. Wind chill values between -5 and -15. Northwest wind 5 to 10 mph becoming southwest in the afternoon.
Tonight
Snow, mainly after 10pm. Low around 16. South wind 5 to 10 mph. Chance of precipitation is 100%. New snow accumulation of around an inch possible.
Wednesday
Mostly cloudy, with a high near 40. Southwest wind 5 to 10 mph.
Wednesday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 32. Southwest wind around 5 mph.
Thursday
Partly sunny, with a high near 43. South wind around 5 mph becoming north in the afternoon.
Thursday Night
Mostly cloudy, with a low around 33. Northeast wind around 5 mph becoming south in the evening.
Friday
Mostly cloudy, with a high near 48. Southwest wind 5 to 10 mph.
Friday Night
Mostly cloudy, with a low around 34. East wind around 5 mph becoming south after midnight.
Saturday
Mostly sunny, with a high near 57.
Saturday Night
Mostly cloudy, with a low around 36.
Sunday
Mostly cloudy, with a high near 51.
Sunday Night
Mostly cloudy, with a low around 27.
Monday
Sunny, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sun Prairie WI
 43.17°N 89.24°W (Elev. 965 ft)
Last Update:
3:32 am CDT Mar 17, 2026
Forecast Valid:
4am CDT Mar 17, 2026-6pm CDT Mar 23, 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