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

-15°C

Humidity 64%
Wind Speed Calm
Barometer 30.06 in (1020.1 mb)
Dewpoint -5°F (-21°C)
Visibility 10.00 mi
Last update 17 Mar 2:55 am CDT
Extended Forecast for

Tomah WI

  • Overnight

    Overnight: Mostly clear, with a low around -3. Wind chill values as low as -13. Northwest wind around 8 mph.

    Low: -3 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 22. Wind chill values as low as -15. West wind 5 to 8 mph becoming south in the afternoon.

    High: 22 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Snow before 4am, then snow likely, possibly mixed with freezing rain. Low around 14. South wind 7 to 10 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of 1 to 3 inches possible.

    Low: 14 °F

    Snow then
    Wintry Mix

  • Wednesday

    Wednesday: A chance of snow and freezing rain, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 43. West wind around 8 mph. Chance of precipitation is 30%.

    High: 43 °F

    Chance Wintry
    Mix then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 31. Southwest wind around 5 mph becoming calm in the evening.

    Low: 31 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 47. Light and variable wind becoming northwest 5 to 8 mph in the morning.

    High: 47 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 31. Southwest wind 3 to 5 mph.

    Low: 31 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 51. Southwest wind 5 to 7 mph.

    High: 51 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 31. Southeast wind around 5 mph.

    Low: 31 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around -3. Wind chill values as low as -13. Northwest wind around 8 mph.
Tuesday
Increasing clouds, with a high near 22. Wind chill values as low as -15. West wind 5 to 8 mph becoming south in the afternoon.
Tuesday Night
Snow before 4am, then snow likely, possibly mixed with freezing rain. Low around 14. South wind 7 to 10 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. Little or no ice accumulation expected. New snow accumulation of 1 to 3 inches possible.
Wednesday
A chance of snow and freezing rain, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 43. West wind around 8 mph. Chance of precipitation is 30%.
Wednesday Night
A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 31. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 47. Light and variable wind becoming northwest 5 to 8 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 31. Southwest wind 3 to 5 mph.
Friday
Partly sunny, with a high near 51. Southwest wind 5 to 7 mph.
Friday Night
Mostly cloudy, with a low around 31. Southeast wind around 5 mph.
Saturday
Mostly sunny, with a high near 57. South wind 5 to 9 mph, with gusts as high as 18 mph.
Saturday Night
Mostly cloudy, with a low around 32. West wind around 9 mph becoming north after midnight. Winds could gust as high as 20 mph.
Sunday
A slight chance of rain and snow. Partly sunny, with a high near 49. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 23. North wind around 7 mph.
Monday
Sunny, with a high near 43. North wind 6 to 9 mph becoming southeast in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Tomah WI
 43.97°N 90.51°W
Last Update:
1:26 am CDT Mar 17, 2026
Forecast Valid:
3am CDT Mar 17, 2026-6pm CDT Mar 23, 2026
 
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Additional Resources

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Chance of Precipitation