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

19°F

-7°C

Humidity 80%
Wind Speed Calm
Barometer 29.94 in (1015.7 mb)
Dewpoint 14°F (-10°C)
Visibility 9.00 mi
Last update 18 Mar 1:55 am CDT
Extended Forecast for

Tomah WI

  • Overnight

    Overnight: Snow likely before 4am, then a chance of snow and freezing rain. Mostly cloudy, with a steady temperature around 19. South wind around 9 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. Total nighttime snow accumulation of less than one inch possible.

    Low: 19 °F

    Wintry Mix
    Likely

  • Wednesday

    Wednesday: Partly sunny, with a high near 40. South wind around 8 mph becoming west in the afternoon. Winds could gust as high as 20 mph.

    High: 40 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain before 4am, then a chance of snow between 4am and 5am, then a chance of rain and snow after 5am. Mostly cloudy, with a low around 29. Light and variable wind. Chance of precipitation is 40%. Little or no snow accumulation expected.

    Low: 29 °F

    Slight Chance
    Rain then
    Chance
    Rain/Snow

  • Thursday

    Thursday: A 10 percent chance of rain before 7am. Partly sunny, with a high near 46. Light northeast wind.

    High: 46 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 33. Calm wind becoming south around 5 mph after midnight.

    Low: 33 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 58. Southwest wind around 6 mph becoming northwest in the afternoon.

    High: 58 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36. Light and variable wind.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 67. Light southwest wind increasing to 5 to 9 mph in the morning.

    High: 67 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of rain before 1am, then a slight chance of rain and snow. Mostly cloudy, with a low around 33. West wind 7 to 9 mph becoming northeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 20%.

    Low: 33 °F

    Slight Chance
    Rain then
    Slight Chance
    Rain/Snow

Detailed Forecast

Overnight
Snow likely before 4am, then a chance of snow and freezing rain. Mostly cloudy, with a steady temperature around 19. South wind around 9 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. Total nighttime snow accumulation of less than one inch possible.
Wednesday
Partly sunny, with a high near 40. South wind around 8 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
A chance of rain before 4am, then a chance of snow between 4am and 5am, then a chance of rain and snow after 5am. Mostly cloudy, with a low around 29. Light and variable wind. Chance of precipitation is 40%. Little or no snow accumulation expected.
Thursday
A 10 percent chance of rain before 7am. Partly sunny, with a high near 46. Light northeast wind.
Thursday Night
Mostly cloudy, with a low around 33. Calm wind becoming south around 5 mph after midnight.
Friday
Partly sunny, with a high near 58. Southwest wind around 6 mph becoming northwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 36. Light and variable wind.
Saturday
Mostly sunny, with a high near 67. Light southwest wind increasing to 5 to 9 mph in the morning.
Saturday Night
A slight chance of rain before 1am, then a slight chance of rain and snow. Mostly cloudy, with a low around 33. West wind 7 to 9 mph becoming northeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 20%.
Sunday
Partly sunny, with a high near 46. North wind around 10 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 21. Northeast wind 3 to 7 mph.
Monday
Partly sunny, with a high near 45. East wind 3 to 7 mph.
Monday Night
Partly cloudy, with a low around 26. South wind around 6 mph.
Tuesday
Mostly cloudy, with a high near 52. Southwest wind 6 to 8 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:
1:26 am CDT Mar 18, 2026
Forecast Valid:
2am CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation