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.

Mostly Cloudy

81°F

27°C

Humidity 66%
Wind Speed W 10 G 17 mph
Barometer 29.97 in (1014.7 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 4 Aug 1:55 pm CDT
Extended Forecast for

3 Miles SW Ontario WI

  • This Afternoon

    This Afternoon: Isolated showers after 5pm. Mostly cloudy, with a high near 79. Northwest wind around 7 mph. Chance of precipitation is 10%.

    High: 79 °F

    Isolated
    Showers

  • Tonight

    Tonight: Scattered showers and thunderstorms, then showers likely after 11pm. Cloudy, with a low around 58. Light northwest wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 58 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Isolated showers before 7am. Partly sunny, with a high near 78. Calm wind. Chance of precipitation is 10%.

    High: 78 °F

    Isolated
    Showers then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 53. Calm wind.

    Low: 53 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 82. Light and variable wind.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57. Light south wind.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers. Partly cloudy, with a low around 60. Southwest wind 3 to 8 mph.

    Low: 60 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 83. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 83 °F

    Sunny

Detailed Forecast

This Afternoon
Isolated showers after 5pm. Mostly cloudy, with a high near 79. Northwest wind around 7 mph. Chance of precipitation is 10%.
Tonight
Scattered showers and thunderstorms, then showers likely after 11pm. Cloudy, with a low around 58. Light northwest wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Isolated showers before 7am. Partly sunny, with a high near 78. Calm wind. Chance of precipitation is 10%.
Wednesday Night
Increasing clouds, with a low around 53. Calm wind.
Thursday
Sunny, with a high near 82. Light and variable wind.
Thursday Night
Mostly clear, with a low around 57. Light south wind.
Friday
Sunny, with a high near 83. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 18 mph.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 60. Southwest wind 3 to 8 mph.
Saturday
Sunny, with a high near 83. Calm wind becoming southwest around 6 mph in the afternoon.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 62. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.
Sunday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64. Southwest wind around 5 mph becoming calm in the evening.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. Calm wind becoming northeast around 6 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Ontario WI
 43.71°N 90.64°W
Last Update:
1:26 pm CDT Aug 4, 2026
Forecast Valid:
2pm CDT Aug 4, 2026-6pm CDT Aug 10, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation