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.

A Few Clouds

12°F

-11°C

Humidity 51%
Wind Speed Calm
Barometer 30.15 in (1024.3 mb)
Dewpoint -3°F (-19°C)
Visibility 10.00 mi
Last update 20 Jan 4:55 pm CST
Extended Forecast for

Sparta WI

Extreme Cold Watch January 23, 12:00am until January 24, 12:00pm
Click here for hazard details and duration
Extreme Cold Watch

  • Tonight

    Tonight: Snow likely before 4am, then a chance of flurries between 4am and 5am. Cloudy, with a low around 8. Light and variable wind. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.

    Low: 8 °F

    Snow Likely

  • Wednesday

    Wednesday: Snow, mainly after 1pm. High near 24. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New snow accumulation of around an inch possible.

    High: 24 °F

    Mostly Cloudy
    then Snow

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow before 9pm. Mostly cloudy, with a low around 2. West wind 5 to 11 mph, with gusts as high as 28 mph.

    Low: 2 °F

    Chance Snow
    then Partly
    Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 13. Wind chill values as low as -6. Light west wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 22 mph.

    High: 13 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -18. Northwest wind 6 to 9 mph, with gusts as high as 21 mph.

    Low: -18 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near -6. Northwest wind 3 to 8 mph.

    High: -6 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around -21. Calm wind.

    Low: -21 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 2. Calm wind.

    High: 2 °F

    Cold

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around -10. Calm wind.

    Low: -10 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Snow likely before 4am, then a chance of flurries between 4am and 5am. Cloudy, with a low around 8. Light and variable wind. Chance of precipitation is 60%. Total nighttime snow accumulation of less than one inch possible.
Wednesday
Snow, mainly after 1pm. High near 24. Light southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New snow accumulation of around an inch possible.
Wednesday Night
A 30 percent chance of snow before 9pm. Mostly cloudy, with a low around 2. West wind 5 to 11 mph, with gusts as high as 28 mph.
Thursday
Partly sunny, with a high near 13. Wind chill values as low as -6. Light west wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 22 mph.
Thursday Night
Partly cloudy, with a low around -18. Northwest wind 6 to 9 mph, with gusts as high as 21 mph.
Friday
Mostly sunny and cold, with a high near -6. Northwest wind 3 to 8 mph.
Friday Night
Partly cloudy, with a low around -21. Calm wind.
Saturday
Mostly sunny and cold, with a high near 2. Calm wind.
Saturday Night
Mostly cloudy, with a low around -10. Calm wind.
Sunday
Partly sunny, with a high near 8. Light west wind.
Sunday Night
Partly cloudy, with a low around -8. Calm wind.
Monday
Mostly sunny, with a high near 15. Calm wind becoming west around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 2. Light southwest wind.
Tuesday
Partly sunny, with a high near 21. Calm wind becoming west around 5 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:
4:36 pm CST Jan 20, 2026
Forecast Valid:
5pm CST Jan 20, 2026-6pm CST Jan 27, 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