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

57°F

14°C

Humidity 98%
Wind Speed Calm
Barometer 29.97 in (1015.0 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 27 Aug 12:55 am CDT
Extended Forecast for

Tomah WI

  • Overnight

    Overnight: Mostly clear, with a low around 56. Calm wind.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 51. Calm wind.

    Low: 51 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83. Light and variable wind.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 60. Light and variable wind.

    Low: 60 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 79. South wind 5 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South wind 8 to 10 mph, with gusts as high as 24 mph.

    Low: 64 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 86. South wind 8 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68. South wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 56. Calm wind.
Thursday
Sunny, with a high near 81. Calm wind becoming northwest around 6 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 51. Calm wind.
Friday
Sunny, with a high near 83. Light and variable wind.
Friday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 60. Light and variable wind.
Saturday
Showers likely, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 79. South wind 5 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South wind 8 to 10 mph, with gusts as high as 24 mph.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 86. South wind 8 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Sunday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68. South wind 6 to 8 mph, with gusts as high as 20 mph.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 86. Southwest wind around 8 mph.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm in the evening.
Tuesday
A 30 percent chance of showers. Mostly sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 63. Calm wind.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 84. Calm wind becoming south around 5 mph 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:
12:36 am CDT Aug 27, 2026
Forecast Valid:
1am CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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