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

-5°F

-21°C

Humidity 72%
Wind Speed Calm
Barometer 30.23 in (1027.2 mb)
Dewpoint -11°F (-24°C)
Visibility 10.00 mi
Last update 19 Jan 7:55 pm CST
Extended Forecast for

2 Miles N Ontario WI

  • Tonight

    Tonight: Partly cloudy, with a low around -7. Wind chill values as low as -16. West wind 3 to 7 mph. Winds could gust as high as 18 mph.

    Low: -7 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 15. Wind chill values as low as -16. Calm wind becoming west 5 to 7 mph in the morning.

    High: 15 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Snow, mainly after 7pm. Steady temperature around 12. Calm wind. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.

    Low: 12 °F

    Snow

  • Wednesday

    Wednesday: A 50 percent chance of snow after noon. Mostly cloudy, with a high near 23. Light west wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 20 mph. New snow accumulation of less than a half inch possible.

    High: 23 °F

    Mostly Cloudy
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 2. West wind 6 to 9 mph, with gusts as high as 21 mph.

    Low: 2 °F

    Slight Chance
    Snow then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 13. West wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 13 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -19. Northwest wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: -19 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near -5. Northwest wind 5 to 8 mph.

    High: -5 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around -20. Light northwest wind.

    Low: -20 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around -7. Wind chill values as low as -16. West wind 3 to 7 mph. Winds could gust as high as 18 mph.
Tuesday
Increasing clouds, with a high near 15. Wind chill values as low as -16. Calm wind becoming west 5 to 7 mph in the morning.
Tuesday Night
Snow, mainly after 7pm. Steady temperature around 12. Calm wind. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
Wednesday
A 50 percent chance of snow after noon. Mostly cloudy, with a high near 23. Light west wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 20 mph. New snow accumulation of less than a half inch possible.
Wednesday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 2. West wind 6 to 9 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 13. West wind 6 to 11 mph, with gusts as high as 21 mph.
Thursday Night
Partly cloudy, with a low around -19. Northwest wind 6 to 8 mph, with gusts as high as 20 mph.
Friday
Mostly sunny and cold, with a high near -5. Northwest wind 5 to 8 mph.
Friday Night
Partly cloudy, with a low around -20. Light northwest wind.
Saturday
Mostly sunny and cold, with a high near 0. Light west wind.
Saturday Night
Partly cloudy, with a low around -15. Calm wind.
Sunday
Mostly sunny, with a high near 10. Calm wind becoming southwest around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around -5. Light southwest wind.
Monday
Mostly sunny, with a high near 15. Calm wind becoming west 5 to 7 mph in the morning.
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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:
5:16 pm CST Jan 19, 2026
Forecast Valid:
8pm CST Jan 19, 2026-6pm CST Jan 26, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation