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

85°F

29°C

Humidity 64%
Wind Speed Calm
Barometer 29.86 in (1011.0 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 2 Sep 6:55 pm CDT
Extended Forecast for

Sparta WI

  • Tonight

    Tonight: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms, mainly before 4am. Low around 66. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 88. Heat index values as high as 97. Light south wind. Chance of precipitation is 30%.

    High: 88 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 86. Light southeast wind.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear
    then Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. Light south wind.

    High: 84 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 65. Calm wind.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and thunderstorms, mainly before 4am. Low around 66. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 88. Heat index values as high as 97. Light south wind. Chance of precipitation is 30%.
Friday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 86. Light southeast wind.
Saturday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 64. Calm wind.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. Light south wind.
Sunday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. Calm wind.
Labor Day
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Southeast wind 3 to 5 mph.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 81. South wind 6 to 11 mph, with gusts as high as 22 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind 6 to 9 mph, with gusts as high as 23 mph.
Wednesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 81. West wind 6 to 10 mph, with gusts as high as 20 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sparta WI
 43.95°N 90.81°W
Last Update:
6:36 pm CDT Sep 2, 2026
Forecast Valid:
7pm CDT Sep 2, 2026-6pm CDT Sep 9, 2026
 
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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