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

25°F

-4°C

Humidity 96%
Wind Speed Calm
Barometer 30.15 in (1022.4 mb)
Dewpoint 24°F (-4°C)
Visibility 9.00 mi
Last update 9 Jan 7:55 pm CST
Extended Forecast for

2 Miles N Ontario WI

  • Tonight

    Tonight: A 50 percent chance of snow, mainly after 4am. Mostly cloudy, with a steady temperature around 28. Light and variable wind. Total nighttime snow accumulation of less than a half inch possible.

    Low: 28 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: A 50 percent chance of snow. Cloudy, then gradually becoming mostly sunny, with a high near 31. Light west wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 25 mph. New snow accumulation of less than one inch possible.

    High: 31 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 16. Northwest wind 10 to 13 mph, with gusts as high as 25 mph.

    Low: 16 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 28. Northwest wind 6 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 23 mph.

    High: 28 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 20. Southwest wind around 6 mph, with gusts as high as 18 mph.

    Low: 20 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 41. West wind 5 to 7 mph.

    High: 41 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 29. Southwest wind around 6 mph.

    Low: 29 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Tuesday

    Tuesday: A 40 percent chance of rain. Mostly cloudy, with a high near 44. West wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 44 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain before midnight, then a chance of snow. Mostly cloudy, with a low around 22. West wind 6 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 22 °F

    Chance Rain
    then Chance
    Snow

Detailed Forecast

Tonight
A 50 percent chance of snow, mainly after 4am. Mostly cloudy, with a steady temperature around 28. Light and variable wind. Total nighttime snow accumulation of less than a half inch possible.
Saturday
A 50 percent chance of snow. Cloudy, then gradually becoming mostly sunny, with a high near 31. Light west wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 25 mph. New snow accumulation of less than one inch possible.
Saturday Night
Mostly cloudy, with a low around 16. Northwest wind 10 to 13 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 28. Northwest wind 6 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 20. Southwest wind around 6 mph, with gusts as high as 18 mph.
Monday
Sunny, with a high near 41. West wind 5 to 7 mph.
Monday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 29. Southwest wind around 6 mph.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 44. West wind 6 to 10 mph, with gusts as high as 21 mph.
Tuesday Night
A chance of rain before midnight, then a chance of snow. Mostly cloudy, with a low around 22. West wind 6 to 8 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of snow, mainly before noon. Partly sunny, with a high near 28. North wind 7 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 13. North wind around 6 mph becoming calm in the evening.
Thursday
A 20 percent chance of snow. Mostly sunny, with a high near 28. Calm wind becoming southwest 5 to 7 mph in the morning.
Thursday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 19. South wind around 6 mph.
Friday
A 40 percent chance of snow. Mostly cloudy, with a high near 30. Southwest wind 6 to 9 mph becoming west in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Ontario WI
 43.75°N 90.58°W
Last Update:
6:41 pm CST Jan 9, 2026
Forecast Valid:
8pm CST Jan 9, 2026-6pm CST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation