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

66°F

19°C

Humidity 88%
Wind Speed Calm
Barometer 30.01 in (1016.5 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 27 Aug 7:55 pm CDT
Extended Forecast for

Sparta WI

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, partly cloudy, with a low around 48. Calm wind.

    Low: 48 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 62. Light south wind.

    Low: 62 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Light south wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 4am, then a slight chance of showers. Mostly cloudy, with a low around 65. South wind 5 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. South wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 89 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 71. South wind 3 to 6 mph.

    Low: 71 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 91. Southwest wind around 6 mph.

    High: 91 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, partly cloudy, with a low around 48. Calm wind.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 62. Light south wind.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Light south wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Mostly cloudy, with a low around 65. South wind 5 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. South wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 71. South wind 3 to 6 mph.
Monday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 91. Southwest wind around 6 mph.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 67. Calm wind.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 88. Light and variable wind.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. Calm wind.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64. Calm wind.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. Calm wind becoming south around 6 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:
6:26 pm CDT Aug 27, 2026
Forecast Valid:
8pm CDT Aug 27, 2026-6pm CDT Sep 3, 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