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

-6°F

-21°C

Humidity 83%
Wind Speed Calm
Barometer 30.37 in (1031.5 mb)
Dewpoint -10°F (-23°C)
Visibility 10.00 mi
Last update 7 Dec 9:55 pm CST
Extended Forecast for

4 Miles NNW Tunnel City WI

  • Tonight

    Tonight: Mostly cloudy, with a temperature falling to near -3 by midnight, then rising to around 4 during the remainder of the night. Calm wind.

    Low: -3 °F⇑

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 21. Wind chill values as low as zero. Calm wind becoming south 5 to 8 mph in the morning. Winds could gust as high as 18 mph.

    High: 21 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Snow likely, mainly before midnight. Cloudy, with a temperature rising to around 25 by 5am. South wind 9 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 17 °F⇑

    Snow Likely

  • Tuesday

    Tuesday: Snow likely after noon. Cloudy, with a high near 33. West wind 6 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 33 °F

    Mostly Cloudy
    then Snow
    Likely

  • Tuesday Night

    Tuesday Night: Rain and snow, becoming all snow after 3am. Low around 21. South wind 9 to 14 mph becoming northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    Low: 21 °F

    Rain/Snow
    then
    Rain/Snow
    Likely

  • Wednesday

    Wednesday: A 30 percent chance of snow before noon. Mostly cloudy, with a high near 28. Northwest wind 9 to 14 mph, with gusts as high as 26 mph.

    High: 28 °F

    Chance Snow
    then Mostly
    Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 1. Northwest wind 5 to 8 mph.

    Low: 1 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of snow, mainly after noon. Partly sunny, with a high near 17. Northwest wind around 6 mph.

    High: 17 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around -2. West wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: -2 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly cloudy, with a temperature falling to near -3 by midnight, then rising to around 4 during the remainder of the night. Calm wind.
Monday
Mostly cloudy, with a high near 21. Wind chill values as low as zero. Calm wind becoming south 5 to 8 mph in the morning. Winds could gust as high as 18 mph.
Monday Night
Snow likely, mainly before midnight. Cloudy, with a temperature rising to around 25 by 5am. South wind 9 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Tuesday
Snow likely after noon. Cloudy, with a high near 33. West wind 6 to 10 mph becoming south in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Tuesday Night
Rain and snow, becoming all snow after 3am. Low around 21. South wind 9 to 14 mph becoming northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Wednesday
A 30 percent chance of snow before noon. Mostly cloudy, with a high near 28. Northwest wind 9 to 14 mph, with gusts as high as 26 mph.
Wednesday Night
Mostly cloudy, with a low around 1. Northwest wind 5 to 8 mph.
Thursday
A 30 percent chance of snow, mainly after noon. Partly sunny, with a high near 17. Northwest wind around 6 mph.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around -2. West wind 6 to 10 mph, with gusts as high as 18 mph.
Friday
A 20 percent chance of snow. Mostly cloudy, with a high near 9. Northwest wind 10 to 13 mph, with gusts as high as 23 mph.
Friday Night
Mostly cloudy, with a low around -9. Northwest wind 10 to 13 mph, with gusts as high as 23 mph.
Saturday
Partly sunny and cold, with a high near 4. West wind 8 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around -9. West wind around 7 mph.
Sunday
Partly sunny, with a high near 11. Southwest wind around 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Tunnel City WI
 44.05°N 90.6°W
Last Update:
9:26 pm CST Dec 7, 2025
Forecast Valid:
10pm CST Dec 7, 2025-6pm CST Dec 14, 2025
 
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