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

-4°F

-20°C

Humidity 83%
Wind Speed Calm
Barometer 30.27 in (1028.2 mb)
Dewpoint -8°F (-22°C)
Visibility 9.00 mi
Last update 28 Jan 8:55 pm CST
Extended Forecast for

2 Miles N Ontario WI

  • Tonight

    Tonight: Partly cloudy, with a low around -9. Wind chill values as low as -17. Northwest wind around 5 mph becoming calm in the evening.

    Low: -9 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 12. Wind chill values as low as -10. Calm wind becoming northwest around 5 mph.

    High: 12 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -5. Calm wind.

    Low: -5 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 14. Wind chill values as low as -10. Calm wind becoming north 5 to 8 mph in the morning.

    High: 14 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around -1. North wind around 5 mph becoming calm in the evening.

    Low: -1 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 21. Light northwest wind.

    High: 21 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 2. Calm wind.

    Low: 2 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after noon. Mostly sunny, with a high near 26. Calm wind becoming south around 6 mph.

    High: 26 °F

    Mostly Sunny
    then Chance
    Snow

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 13. Calm wind.

    Low: 13 °F

    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around -9. Wind chill values as low as -17. Northwest wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 12. Wind chill values as low as -10. Calm wind becoming northwest around 5 mph.
Thursday Night
Partly cloudy, with a low around -5. Calm wind.
Friday
Mostly sunny, with a high near 14. Wind chill values as low as -10. Calm wind becoming north 5 to 8 mph in the morning.
Friday Night
Partly cloudy, with a low around -1. North wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 21. Light northwest wind.
Saturday Night
Partly cloudy, with a low around 2. Calm wind.
Sunday
A 30 percent chance of snow after noon. Mostly sunny, with a high near 26. Calm wind becoming south around 6 mph.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 13. Calm wind.
Monday
Partly sunny, with a high near 28. Calm wind becoming west around 6 mph.
Monday Night
Partly cloudy, with a low around 9. Calm wind.
Tuesday
Partly sunny, with a high near 28. Calm wind becoming east around 5 mph.
Tuesday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 15. Calm wind.
Wednesday
A 20 percent chance of snow. Mostly cloudy, with a high near 29. Calm wind becoming west around 6 mph.
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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:
5:36 pm CST Jan 28, 2026
Forecast Valid:
9pm CST Jan 28, 2026-6pm CST Feb 4, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation