National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Overcast

35°F

2°C

Humidity 97%
Wind Speed Calm
Barometer 29.89 in (1013.3 mb)
Dewpoint 34°F (1°C)
Visibility 8.00 mi
Last update 26 Dec 7:55 pm CST
Extended Forecast for

Wilton WI

  • Tonight

    Tonight: Widespread dense fog before midnight, then widespread dense fog after 4am. Widespread dense freezing fog between midnight and 4am. Otherwise, mostly cloudy, with a low around 31. Calm wind.

    Low: 31 °F

    Dense
    Freezing Fog
    and Dense Fog

  • Saturday

    Saturday: Widespread dense fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 44. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

    High: 44 °F

    Dense Fog
    then Mostly
    Cloudy

  • Saturday Night

    Saturday Night: A chance of drizzle, mainly before midnight. Mostly cloudy, with a low around 35. Southeast wind around 6 mph becoming calm in the evening.

    Low: 35 °F

    Chance
    Drizzle

  • Sunday

    Sunday: Rain before 3pm, then rain and snow. High near 42. Light and variable wind becoming northwest 10 to 15 mph in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 42 °F

    Chance Rain
    then
    Rain/Snow

  • Sunday Night

    Sunday Night: Snow likely, mainly before midnight. Mostly cloudy, with a low around 10. Blustery, with a northwest wind 16 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 60%. New snow accumulation of 2 to 4 inches possible.

    Low: 10 °F

    Snow Likely
    and Blustery

  • Monday

    Monday: A 30 percent chance of snow before noon. Partly sunny, with a high near 17. Blustery, with a northwest wind 16 to 22 mph, with gusts as high as 36 mph.

    High: 17 °F

    Blustery.
    Chance Snow
    then Partly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 4. Northwest wind 6 to 14 mph, with gusts as high as 28 mph.

    Low: 4 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of snow after noon. Partly sunny, with a high near 26. West wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 26 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 9. Northwest wind around 9 mph, with gusts as high as 21 mph.

    Low: 9 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Widespread dense fog before midnight, then widespread dense fog after 4am. Widespread dense freezing fog between midnight and 4am. Otherwise, mostly cloudy, with a low around 31. Calm wind.
Saturday
Widespread dense fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 44. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Saturday Night
A chance of drizzle, mainly before midnight. Mostly cloudy, with a low around 35. Southeast wind around 6 mph becoming calm in the evening.
Sunday
Rain before 3pm, then rain and snow. High near 42. Light and variable wind becoming northwest 10 to 15 mph in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Sunday Night
Snow likely, mainly before midnight. Mostly cloudy, with a low around 10. Blustery, with a northwest wind 16 to 22 mph, with gusts as high as 36 mph. Chance of precipitation is 60%. New snow accumulation of 2 to 4 inches possible.
Monday
A 30 percent chance of snow before noon. Partly sunny, with a high near 17. Blustery, with a northwest wind 16 to 22 mph, with gusts as high as 36 mph.
Monday Night
Partly cloudy, with a low around 4. Northwest wind 6 to 14 mph, with gusts as high as 28 mph.
Tuesday
A 20 percent chance of snow after noon. Partly sunny, with a high near 26. West wind 6 to 10 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 9. Northwest wind around 9 mph, with gusts as high as 21 mph.
Wednesday
Partly sunny, with a high near 17. Northwest wind 9 to 11 mph, with gusts as high as 21 mph.
Wednesday Night
Partly cloudy, with a low around -4. Northwest wind around 9 mph, with gusts as high as 20 mph.
New Year's Day
Sunny, with a high near 9. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around -7. West wind 3 to 7 mph.
Friday
Mostly sunny, with a high near 14. West wind 3 to 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Wilton WI
 43.81°N 90.52°W
Last Update:
7:31 pm CST Dec 26, 2025
Forecast Valid:
8pm CST Dec 26, 2025-6pm CST Jan 2, 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