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

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Fair

58°F

14°C

Humidity 94%
Wind Speed Calm
Barometer 30.00 in (1015.9 mb)
Dewpoint 56°F (13°C)
Visibility 9.00 mi
Last update 9 Sep 10:55 pm CDT
Extended Forecast for

Sparta WI

  • Tonight

    Tonight: Mostly clear, with a low around 49. Calm wind.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80. Light and variable wind.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 52. Calm wind becoming south around 5 mph after midnight.

    Low: 52 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 82. South wind 5 to 13 mph, with gusts as high as 22 mph.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 61. South wind around 11 mph, with gusts as high as 22 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 61 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: A chance of thunderstorms before 7am. Mostly sunny, with a high near 79. Southwest wind around 9 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    T-storms then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 49. Calm wind.

    Low: 49 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 74. Light and variable wind. Chance of precipitation is 30%.

    High: 74 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 54. Calm wind becoming southeast 5 to 7 mph after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

    Low: 54 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 49. Calm wind.
Thursday
Sunny, with a high near 80. Light and variable wind.
Thursday Night
Clear, with a low around 52. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 82. South wind 5 to 13 mph, with gusts as high as 22 mph.
Friday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 61. South wind around 11 mph, with gusts as high as 22 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of thunderstorms before 7am. Mostly sunny, with a high near 79. Southwest wind around 9 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 49. Calm wind.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 74. Light and variable wind. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 54. Calm wind becoming southeast 5 to 7 mph after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.
Monday
Showers, with thunderstorms also possible after 1pm. High near 80. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. West wind 6 to 13 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.
Tuesday
Partly sunny, with a high near 72. Northwest wind around 6 mph.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 49. Calm wind.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 73. Light and variable wind.
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ABOUT THIS FORECAST

 
Point Forecast:
Sparta WI
 43.95°N 90.81°W
Last Update:
9:16 pm CDT Sep 9, 2026
Forecast Valid:
11pm CDT Sep 9, 2026-6pm CDT Sep 16, 2026
 
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Additional Resources

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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