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.

Partly Cloudy

53°F

12°C

Humidity 60%
Wind Speed E 13 G 26 mph
Barometer 29.64 in (1004.5 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 17 Feb 3:55 pm CST
Extended Forecast for

Tomah WI

  • Tonight

    Tonight: Rain and thunderstorms before 3am, then a chance of showers and thunderstorms between 3am and 5am. Low around 41. Breezy, with an east wind 10 to 18 mph becoming south after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 41 °F

    Showers and
    Breezy

  • Wednesday

    Wednesday: A 20 percent chance of rain between 1pm and 2pm. Mostly sunny, with a high near 55. Breezy, with a west wind 13 to 21 mph, with gusts as high as 33 mph.

    High: 55 °F

    Slight Chance
    Rain and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 27. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.

    Low: 27 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of rain after noon. Mostly sunny, with a high near 47. Calm wind becoming northeast 5 to 8 mph in the morning.

    High: 47 °F

    Mostly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: A chance of rain before 9pm, then rain and snow likely between 9pm and 3am, then snow likely after 3am. Mostly cloudy, with a low around 26. Northeast wind 6 to 9 mph becoming northwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    Low: 26 °F

    Rain/Snow
    Likely

  • Friday

    Friday: A 50 percent chance of snow. Mostly cloudy, with a high near 35. West wind 9 to 13 mph, with gusts as high as 22 mph. New snow accumulation of around an inch possible.

    High: 35 °F

    Chance Snow

  • Friday Night

    Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 19. West wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 19 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of snow after noon. Partly sunny, with a high near 34. Northwest wind 6 to 9 mph.

    High: 34 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Saturday Night

    Saturday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 15. Northwest wind around 8 mph, with gusts as high as 18 mph.

    Low: 15 °F

    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Tonight
Rain and thunderstorms before 3am, then a chance of showers and thunderstorms between 3am and 5am. Low around 41. Breezy, with an east wind 10 to 18 mph becoming south after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 20 percent chance of rain between 1pm and 2pm. Mostly sunny, with a high near 55. Breezy, with a west wind 13 to 21 mph, with gusts as high as 33 mph.
Wednesday Night
Mostly clear, with a low around 27. West wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph.
Thursday
A 30 percent chance of rain after noon. Mostly sunny, with a high near 47. Calm wind becoming northeast 5 to 8 mph in the morning.
Thursday Night
A chance of rain before 9pm, then rain and snow likely between 9pm and 3am, then snow likely after 3am. Mostly cloudy, with a low around 26. Northeast wind 6 to 9 mph becoming northwest after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Friday
A 50 percent chance of snow. Mostly cloudy, with a high near 35. West wind 9 to 13 mph, with gusts as high as 22 mph. New snow accumulation of around an inch possible.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 19. West wind 6 to 8 mph, with gusts as high as 20 mph.
Saturday
A 20 percent chance of snow after noon. Partly sunny, with a high near 34. Northwest wind 6 to 9 mph.
Saturday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 15. Northwest wind around 8 mph, with gusts as high as 18 mph.
Sunday
Partly sunny, with a high near 28. Northwest wind 8 to 11 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 8. North wind 3 to 8 mph. Winds could gust as high as 18 mph.
Monday
Sunny, with a high near 29. North wind 3 to 5 mph.
Monday Night
Partly cloudy, with a low around 13. Calm wind becoming southeast around 6 mph after midnight.
Tuesday
A 20 percent chance of snow. Mostly sunny, with a high near 36. Southeast wind 6 to 11 mph, with gusts as high as 22 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Tomah WI
 43.99°N 90.51°W
Last Update:
3:11 pm CST Feb 17, 2026
Forecast Valid:
4pm CST Feb 17, 2026-6pm CST Feb 24, 2026
 
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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