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.

Overcast

21°F

-6°C

Humidity 79%
Wind Speed S 7 mph
Barometer 29.88 in (1013.5 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 18 Mar 4:55 am CDT
Extended Forecast for

Sparta WI

  • Overnight

    Overnight: A slight chance of snow and freezing rain. Cloudy, with a steady temperature around 21. Southwest wind around 6 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    Low: 21 °F

    Slight Chance
    Wintry Mix

  • Wednesday

    Wednesday: A 10 percent chance of rain after 5pm. Cloudy through mid morning, then gradual clearing, with a high near 40. South wind 6 to 8 mph, with gusts as high as 20 mph.

    High: 40 °F

    Slight Chance
    Rain

  • Wednesday Night

    Wednesday Night: Rain, mainly after 11pm. Low around 31. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 31 °F

    Rain

  • Thursday

    Thursday: A 10 percent chance of rain before 7am. Partly sunny, with a high near 47. Light northeast wind.

    High: 47 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 36. Light south wind.

    Low: 36 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 60. Calm wind becoming west around 5 mph in the afternoon.

    High: 60 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38. Calm wind.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 69. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 69 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 35. West wind around 8 mph becoming northeast after midnight. Winds could gust as high as 20 mph.

    Low: 35 °F

    Slight Chance
    Rain

Detailed Forecast

Overnight
A slight chance of snow and freezing rain. Cloudy, with a steady temperature around 21. Southwest wind around 6 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Wednesday
A 10 percent chance of rain after 5pm. Cloudy through mid morning, then gradual clearing, with a high near 40. South wind 6 to 8 mph, with gusts as high as 20 mph.
Wednesday Night
Rain, mainly after 11pm. Low around 31. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A 10 percent chance of rain before 7am. Partly sunny, with a high near 47. Light northeast wind.
Thursday Night
Mostly cloudy, with a low around 36. Light south wind.
Friday
Partly sunny, with a high near 60. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
Mostly cloudy, with a low around 38. Calm wind.
Saturday
Mostly sunny, with a high near 69. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 35. West wind around 8 mph becoming northeast after midnight. Winds could gust as high as 20 mph.
Sunday
Partly sunny, with a high near 48. North wind 8 to 10 mph, with gusts as high as 18 mph.
Sunday Night
Partly cloudy, with a low around 23. North wind 3 to 7 mph.
Monday
Partly sunny, with a high near 45. East wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 27. Southeast wind around 6 mph.
Tuesday
Mostly cloudy, with a high near 53. Southwest wind 5 to 7 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 am CDT Mar 18, 2026
Forecast Valid:
5am CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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