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.

Fog/Mist

36°F

2°C

Humidity 98%
Wind Speed Calm
Barometer 29.64 in (1004.9 mb)
Dewpoint 36°F (2°C)
Visibility 1.25 mi
Last update 6 Jan 3:55 pm CST
Extended Forecast for

Tomah WI

  • This Afternoon

    This Afternoon: A 40 percent chance of rain. Areas of fog. Otherwise, cloudy, with a high near 36. West wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 36 °F

    Chance Rain
    and Areas Fog

  • Tonight

    Tonight: A 30 percent chance of rain before 7pm. Areas of fog before 10pm. Widespread dense freezing fog, mainly between 10pm and 4am. Otherwise, mostly cloudy, with a low around 25. West wind 3 to 7 mph. Winds could gust as high as 18 mph.

    Low: 25 °F

    Chance Rain
    and Areas
    Freezing Fog
    then Dense
    Freezing Fog

  • Wednesday

    Wednesday: Patchy fog between 9am and 11am. Areas of freezing fog before 9am. Otherwise, mostly sunny, with a high near 40. Calm wind becoming south around 6 mph in the morning.

    High: 40 °F

    Areas
    Freezing Fog
    and Patchy
    Fog then
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30. Light south wind.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: Rain likely after noon. Mostly cloudy, with a high near 42. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 42 °F

    Mostly Cloudy
    then Rain
    Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 28. Calm wind becoming north around 6 mph in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 28 °F

    Rain Likely
    then Chance
    Rain

  • Friday

    Friday: A slight chance of rain and snow before noon. Partly sunny, with a high near 38. Northwest wind around 6 mph becoming calm in the afternoon. Chance of precipitation is 20%.

    High: 38 °F

    Slight Chance
    Rain/Snow
    then Partly
    Sunny

  • Friday Night

    Friday Night: A 50 percent chance of snow, mainly after midnight. Mostly cloudy, with a low around 23. Calm wind becoming northeast around 6 mph after midnight.

    Low: 23 °F

    Slight Chance
    Snow then
    Chance Snow

  • Saturday

    Saturday: Snow likely, mainly before noon. Mostly cloudy, with a high near 30. Northwest wind 6 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    High: 30 °F

    Snow Likely

Detailed Forecast

This Afternoon
A 40 percent chance of rain. Areas of fog. Otherwise, cloudy, with a high near 36. West wind around 6 mph. New precipitation amounts of less than a tenth of an inch possible.
Tonight
A 30 percent chance of rain before 7pm. Areas of fog before 10pm. Widespread dense freezing fog, mainly between 10pm and 4am. Otherwise, mostly cloudy, with a low around 25. West wind 3 to 7 mph. Winds could gust as high as 18 mph.
Wednesday
Patchy fog between 9am and 11am. Areas of freezing fog before 9am. Otherwise, mostly sunny, with a high near 40. Calm wind becoming south around 6 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 30. Light south wind.
Thursday
Rain likely after noon. Mostly cloudy, with a high near 42. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 28. Calm wind becoming north around 6 mph in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Friday
A slight chance of rain and snow before noon. Partly sunny, with a high near 38. Northwest wind around 6 mph becoming calm in the afternoon. Chance of precipitation is 20%.
Friday Night
A 50 percent chance of snow, mainly after midnight. Mostly cloudy, with a low around 23. Calm wind becoming northeast around 6 mph after midnight.
Saturday
Snow likely, mainly before noon. Mostly cloudy, with a high near 30. Northwest wind 6 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Saturday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 15. Northwest wind 7 to 10 mph, with gusts as high as 23 mph.
Sunday
Mostly sunny, with a high near 29. West wind 5 to 8 mph.
Sunday Night
Partly cloudy, with a low around 18. Southwest wind around 6 mph.
Monday
Partly sunny, with a high near 38. West wind 6 to 8 mph.
Monday Night
Mostly cloudy, with a low around 24. West wind around 6 mph.
Tuesday
Mostly cloudy, with a high near 36. West wind 5 to 7 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:
3:16 pm CST Jan 6, 2026
Forecast Valid:
4pm CST Jan 6, 2026-6pm CST Jan 13, 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