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

-10°F

-23°C

Humidity 81%
Wind Speed Calm
Barometer 30.23 in (1027.3 mb)
Dewpoint -14°F (-26°C)
Visibility 10.00 mi
Last update 19 Jan 8:55 pm CST
Extended Forecast for

Sparta WI

  • Tonight

    Tonight: Partly cloudy, with a low around -6. Wind chill values as low as -14. West wind 3 to 5 mph.

    Low: -6 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 15. Wind chill values as low as -15. Calm wind becoming southwest 5 to 7 mph.

    High: 15 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Snow, mainly after 7pm. Steady temperature around 12. Calm wind. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    Low: 12 °F

    Snow

  • Wednesday

    Wednesday: A 50 percent chance of snow after noon. Mostly cloudy, with a high near 23. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 18 mph. New snow accumulation of less than a half inch possible.

    High: 23 °F

    Mostly Cloudy
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 2. West wind around 7 mph, with gusts as high as 20 mph.

    Low: 2 °F

    Slight Chance
    Snow then
    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 13. West wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 13 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -17. Northwest wind 5 to 7 mph, with gusts as high as 20 mph.

    Low: -17 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near -6. Northwest wind 5 to 7 mph.

    High: -6 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around -20. Light northwest wind.

    Low: -20 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around -6. Wind chill values as low as -14. West wind 3 to 5 mph.
Tuesday
Increasing clouds, with a high near 15. Wind chill values as low as -15. Calm wind becoming southwest 5 to 7 mph.
Tuesday Night
Snow, mainly after 7pm. Steady temperature around 12. Calm wind. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Wednesday
A 50 percent chance of snow after noon. Mostly cloudy, with a high near 23. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 18 mph. New snow accumulation of less than a half inch possible.
Wednesday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 2. West wind around 7 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 13. West wind 6 to 10 mph, with gusts as high as 21 mph.
Thursday Night
Partly cloudy, with a low around -17. Northwest wind 5 to 7 mph, with gusts as high as 20 mph.
Friday
Mostly sunny and cold, with a high near -6. Northwest wind 5 to 7 mph.
Friday Night
Partly cloudy, with a low around -20. Light northwest wind.
Saturday
Mostly sunny and cold, with a high near 0. Light west wind.
Saturday Night
Partly cloudy, with a low around -15. Calm wind.
Sunday
Mostly sunny, with a high near 10. Calm wind becoming southwest around 5 mph.
Sunday Night
Partly cloudy, with a low around -5. Light southwest wind.
Monday
Mostly sunny, with a high near 15. Calm wind becoming west around 6 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sparta WI
 43.93°N 90.81°W
Last Update:
5:16 pm CST Jan 19, 2026
Forecast Valid:
9pm CST Jan 19, 2026-6pm CST Jan 26, 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