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

85°F

29°C

Humidity 64%
Wind Speed SW 5 mph
Barometer 29.90 in (1012.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 2 Sep 12:55 pm CDT
Extended Forecast for

2 Miles ESE Ontario WI

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 88. Light west wind.

    High: 88 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 1am, then a slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 67. Calm wind. Chance of precipitation is 20%.

    Low: 67 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 4pm. Partly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then showers and possibly a thunderstorm between 1am and 4am, then a chance of showers and thunderstorms after 4am. Low around 67. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Chance
    T-storms then
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 87. Light south wind. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. Light east wind. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °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 southeast around 5 mph in the afternoon.

    High: 83 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 88. Light west wind.
Tonight
A slight chance of showers and thunderstorms before 1am, then a slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 67. Calm wind. Chance of precipitation is 20%.
Thursday
Showers and thunderstorms likely, mainly before 4pm. Partly sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers and thunderstorms before 1am, then showers and possibly a thunderstorm between 1am and 4am, then a chance of showers and thunderstorms after 4am. Low around 67. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Mostly sunny, with a high near 87. Light south wind. Chance of precipitation is 30%.
Friday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 66. Calm wind.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. Light east wind. Chance of precipitation is 20%.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 65. Calm wind.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
A chance of showers, with thunderstorms also possible after 1am. Partly cloudy, with a low around 63. Calm wind. Chance of precipitation is 30%.
Labor Day
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the morning.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Southeast wind around 6 mph.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 80. South 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:
2 Miles ESE Ontario WI
 43.71°N 90.56°W
Last Update:
11:36 am CDT Sep 2, 2026
Forecast Valid:
1pm CDT Sep 2, 2026-6pm CDT Sep 8, 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