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.

Mostly Cloudy

59°F

15°C

Humidity 96%
Wind Speed Calm
Barometer 30.05 in (1017.6 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 29 Aug 5:55 am CDT
Extended Forecast for

Sparta WI

  • Today

    Today: Showers and possibly a thunderstorm before 1pm, then scattered showers and thunderstorms, mainly between 1pm and 4pm. High near 78. East wind 5 to 10 mph becoming south in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    Showers

  • Tonight

    Tonight: A 10 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 65. Southeast wind 3 to 6 mph.

    Low: 65 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 86. Calm wind becoming southwest around 6 mph in the morning.

    High: 86 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Calm wind becoming south around 5 mph after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Partly Cloudy
    then Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 89. South wind around 6 mph.

    High: 89 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 88. Calm wind.

    High: 88 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 87. Calm wind. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

Detailed Forecast

Today
Showers and possibly a thunderstorm before 1pm, then scattered showers and thunderstorms, mainly between 1pm and 4pm. High near 78. East wind 5 to 10 mph becoming south in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
A 10 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 65. Southeast wind 3 to 6 mph.
Sunday
Partly sunny, with a high near 86. Calm wind becoming southwest around 6 mph in the morning.
Sunday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Calm wind becoming south around 5 mph after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
Mostly sunny, with a high near 89. South wind around 6 mph.
Monday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. Calm wind.
Tuesday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 88. Calm wind.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Calm wind.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 87. Calm wind. Chance of precipitation is 30%.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 63. Calm wind.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Light and variable wind.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 63. Calm wind.
Friday
Mostly sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sparta WI
 43.95°N 90.81°W
Last Update:
5:57 am CDT Aug 29, 2026
Forecast Valid:
6am CDT Aug 29, 2026-6pm CDT Sep 4, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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