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

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Fair

78°F

26°C

Humidity 87%
Wind Speed Calm
Barometer 29.85 in (1010.6 mb)
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Heat Index80°F (27°C)
Last update 3 Sep 7:55 pm CDT
Extended Forecast for

Sparta WI

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 11pm, then a chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 68. Light southeast wind. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 68 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 88. Heat index values as high as 95. Light and variable wind.

    High: 88 °F

    Slight Chance
    T-storms then
    Sunny

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Increasing clouds, with a low around 65. Calm wind. Chance of precipitation is 20%.

    Low: 65 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 86. Calm wind.

    High: 86 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 84. Light southeast wind.

    High: 84 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 60. Calm wind.

    Low: 60 °F

    Slight Chance
    T-storms

  • Labor Day

    Labor Day: A 20 percent chance of showers. Partly sunny, with a high near 82. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 82 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. Southeast wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 62 °F

    Chance
    Showers

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before 11pm, then a chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 68. Light southeast wind. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A 20 percent chance of showers and thunderstorms before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 88. Heat index values as high as 95. Light and variable wind.
Friday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Increasing clouds, with a low around 65. Calm wind. Chance of precipitation is 20%.
Saturday
Partly sunny, with a high near 86. Calm wind.
Saturday Night
Partly cloudy, with a low around 61. Calm wind.
Sunday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 84. Light southeast wind.
Sunday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 60. Calm wind.
Labor Day
A 20 percent chance of showers. Partly sunny, with a high near 82. Calm wind becoming south 5 to 7 mph in the afternoon.
Monday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. Southeast wind around 7 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. South wind 7 to 10 mph, with gusts as high as 21 mph.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. Southwest wind 3 to 8 mph. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 85. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 18 mph.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 59. Southwest wind around 5 mph becoming calm in the evening.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 79. Calm wind becoming northwest 5 to 8 mph in the morning.
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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:
8:16 pm CDT Sep 3, 2026
Forecast Valid:
9pm CDT Sep 3, 2026-6pm CDT Sep 10, 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