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.

Mostly Cloudy

25°F

-4°C

Humidity 69%
Wind Speed Calm
Barometer 30.14 in (1022.3 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Last update 5 Feb 12:55 am CST
Extended Forecast for

2 Miles N Ontario WI

  • Overnight

    Overnight: A 50 percent chance of snow, mainly after 4am. Cloudy, with a low around 12. Southwest wind 3 to 5 mph. Total nighttime snow accumulation of less than a half inch possible.

    Low: 12 °F

    Chance Snow

  • Thursday

    Thursday: Snow likely, possibly mixing with freezing rain after 8am, then gradually ending. Mostly cloudy, with a high near 36. South wind 5 to 8 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. New snow accumulation of less than a half inch possible.

    High: 36 °F

    Wintry Mix
    Likely then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: A slight chance of snow between midnight and 3am, then a slight chance of freezing rain after 3am. Mostly cloudy, with a low around 27. Light west wind becoming northwest 5 to 10 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 20%.

    Low: 27 °F

    Mostly Cloudy
    then Slight
    Chance Wintry
    Mix

  • Friday

    Friday: Mostly cloudy, with a high near 37. Breezy, with a northwest wind 11 to 17 mph, with gusts as high as 30 mph.

    High: 37 °F

    Mostly Cloudy
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 4. North wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 21 mph.

    Low: 4 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, with a high near 25. Calm wind becoming south around 6 mph in the afternoon.

    High: 25 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 17. South wind around 5 mph becoming calm after midnight.

    Low: 17 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 38. Calm wind becoming south around 5 mph.

    High: 38 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22. Calm wind.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 50 percent chance of snow, mainly after 4am. Cloudy, with a low around 12. Southwest wind 3 to 5 mph. Total nighttime snow accumulation of less than a half inch possible.
Thursday
Snow likely, possibly mixing with freezing rain after 8am, then gradually ending. Mostly cloudy, with a high near 36. South wind 5 to 8 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. New snow accumulation of less than a half inch possible.
Thursday Night
A slight chance of snow between midnight and 3am, then a slight chance of freezing rain after 3am. Mostly cloudy, with a low around 27. Light west wind becoming northwest 5 to 10 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 20%.
Friday
Mostly cloudy, with a high near 37. Breezy, with a northwest wind 11 to 17 mph, with gusts as high as 30 mph.
Friday Night
Mostly clear, with a low around 4. North wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 21 mph.
Saturday
Partly sunny, with a high near 25. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
Mostly cloudy, with a low around 17. South wind around 5 mph becoming calm after midnight.
Sunday
Partly sunny, with a high near 38. Calm wind becoming south around 5 mph.
Sunday Night
Partly cloudy, with a low around 22. Calm wind.
Monday
Partly sunny, with a high near 46. Calm wind becoming southwest around 6 mph.
Monday Night
Mostly cloudy, with a low around 28. Light and variable wind.
Tuesday
A 20 percent chance of rain. Mostly cloudy, with a high near 44. Light and variable wind becoming east 5 to 7 mph in the morning.
Tuesday Night
A slight chance of rain or freezing rain. Mostly cloudy, with a low around 26. Light north wind. Chance of precipitation is 20%.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 38. North wind 3 to 7 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Ontario WI
 43.75°N 90.58°W
Last Update:
10:13 pm CST Feb 4, 2026
Forecast Valid:
1am CST Feb 5, 2026-6pm CST Feb 11, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation