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.

A Few Clouds

67°F

19°C

Humidity 80%
Wind Speed Calm
Barometer 30.04 in (1017.4 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 5 Aug 9:55 am CDT
Extended Forecast for

3 Miles NNW Ontario WI

  • Today

    Today: Isolated showers before noon. Mostly cloudy, with a high near 76. Light west wind. Chance of precipitation is 20%.

    High: 76 °F

    Isolated
    Showers

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, mostly clear, with a low around 53. Calm wind.

    Low: 53 °F

    Mostly Clear
    then Patchy
    Fog

  • Thursday

    Thursday: Areas of fog before 9am. Otherwise, sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.

    High: 83 °F

    Areas Fog
    then Sunny

  • Thursday Night

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

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 84. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 18 mph. Chance of precipitation is 20%.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 60. Southwest wind around 6 mph becoming calm in the evening.

    Low: 60 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers after 1pm. Sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 84 °F

    Sunny then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62. Light south wind.

    Low: 62 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.

    High: 85 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Isolated showers before noon. Mostly cloudy, with a high near 76. Light west wind. Chance of precipitation is 20%.
Tonight
Patchy fog after 1am. Otherwise, mostly clear, with a low around 53. Calm wind.
Thursday
Areas of fog before 9am. Otherwise, sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 57. Calm wind.
Friday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 84. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 18 mph. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 60. Southwest wind around 6 mph becoming calm in the evening.
Saturday
A 20 percent chance of showers after 1pm. Sunny, with a high near 84. Calm wind becoming southwest around 5 mph in the afternoon.
Saturday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62. Light south wind.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 62. Calm wind.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 60. Light and variable wind.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 79. Light and variable wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Ontario WI
 43.75°N 90.61°W
Last Update:
9:01 am CDT Aug 5, 2026
Forecast Valid:
11am CDT Aug 5, 2026-6pm CDT Aug 11, 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