National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Partly Cloudy

55°F

13°C

Humidity 97%
Wind Speed Calm
Barometer 30.00 in (1015.9 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 7 Aug 5:55 am CDT
Extended Forecast for

3 Miles ENE Ontario WI

  • Today

    Today: A 30 percent chance of showers and thunderstorms after 4pm. Widespread fog before 9am. Otherwise, partly sunny, with a high near 84. Southwest wind 5 to 11 mph, with gusts as high as 20 mph.

    High: 84 °F

    Fog then
    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Partly cloudy, with a low around 59. Southwest wind 5 to 9 mph becoming light and variable. Winds could gust as high as 18 mph. Chance of precipitation is 30%.

    Low: 59 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 82. Calm wind becoming west around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 61. Light south wind.

    Low: 61 °F

    Mostly Clear
    then Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.

    High: 83 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Calm wind. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday

    Monday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Light and variable wind becoming south around 5 mph. Chance of precipitation is 70%.

    High: 81 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 20%.

    Low: 62 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Calm wind. Chance of precipitation is 30%.

    High: 80 °F

    Chance
    Showers

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 4pm. Widespread fog before 9am. Otherwise, partly sunny, with a high near 84. Southwest wind 5 to 11 mph, with gusts as high as 20 mph.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Partly cloudy, with a low around 59. Southwest wind 5 to 9 mph becoming light and variable. Winds could gust as high as 18 mph. Chance of precipitation is 30%.
Saturday
Sunny, with a high near 82. Calm wind becoming west around 5 mph in the afternoon.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 61. Light south wind.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 83. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Calm wind. New rainfall amounts between a quarter and half of an inch possible.
Monday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Light and variable wind becoming south around 5 mph. Chance of precipitation is 70%.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 20%.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Calm wind. Chance of precipitation is 30%.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 59. Calm wind. Chance of precipitation is 20%.
Wednesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. Light and variable wind.
Wednesday Night
Partly cloudy, with a low around 57. Calm wind.
Thursday
Mostly sunny, with a high near 76. Calm wind becoming northwest around 5 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Ontario WI
 43.73°N 90.55°W
Last Update:
6:50 am CDT Aug 7, 2026
Forecast Valid:
7am CDT Aug 7, 2026-6pm CDT Aug 13, 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