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

82°F

28°C

Humidity 68%
Wind Speed Calm
Barometer 29.91 in (1012.6 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 2 Sep 11:55 am CDT
Extended Forecast for

Tomah WI

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 86. Light west wind.

    High: 86 °F

    Mostly Sunny

  • Tonight

    Tonight: A 10 percent chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 85. Light and variable wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms, mainly before 4am. Low around 65. Calm wind. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 65 °F

    Showers
    Likely then
    Showers

  • Friday

    Friday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Partly sunny, with a high near 87. Light south wind. Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 84. Light east wind.

    High: 84 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64. Light southeast wind.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.

    High: 83 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 86. Light west wind.
Tonight
A 10 percent chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 65. Calm wind.
Thursday
Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 85. Light and variable wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and thunderstorms, mainly before 4am. Low around 65. Calm wind. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Friday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Partly sunny, with a high near 87. Light south wind. Chance of precipitation is 20%.
Friday Night
A chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 84. Light east wind.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64. Light southeast wind.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
A chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 40%.
Labor Day
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 79. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Southeast wind around 6 mph.
Tuesday
A 40 percent chance of showers. Mostly sunny, with a high near 79. South wind 7 to 11 mph, with gusts as high as 23 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Tomah WI
 43.99°N 90.51°W
Last Update:
11:36 am CDT Sep 2, 2026
Forecast Valid:
12pm CDT Sep 2, 2026-6pm CDT Sep 8, 2026
 
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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