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

66°F

19°C

Humidity 91%
Wind Speed Calm
Barometer 29.97 in (1014.8 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 8 Aug 1:55 am CDT
Extended Forecast for

5 Miles SSE Ontario WI

  • Overnight

    Overnight: Partly cloudy, with a low around 59. Northwest wind 3 to 5 mph.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 82. Northwest wind 3 to 6 mph.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 61. Light south wind.

    Low: 61 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms likely before 2pm, then a slight chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 81. South wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms, mainly after 7pm. Mostly cloudy, with a low around 65. Calm wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms before 1pm, then a chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 83. Calm wind. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 40%.

    Low: 64 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 82. Calm wind.

    High: 82 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 59. Northwest wind 3 to 5 mph.
Saturday
Sunny, with a high near 82. Northwest wind 3 to 6 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 61. Light south wind.
Sunday
Showers and thunderstorms likely before 2pm, then a slight chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 81. South wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A 50 percent chance of showers and thunderstorms, mainly after 7pm. Mostly cloudy, with a low around 65. Calm wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers and thunderstorms before 1pm, then a chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 83. Calm wind. Chance of precipitation is 30%.
Monday Night
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 40%.
Tuesday
A 50 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 82. Calm wind.
Tuesday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 62. Calm wind.
Wednesday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 81. Calm wind.
Wednesday Night
Partly cloudy, with a low around 60. Calm wind.
Thursday
Partly sunny, with a high near 78. Light north wind.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 56. Calm wind.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 76. Light and variable wind.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Ontario WI
 43.66°N 90.56°W
Last Update:
1:26 am CDT Aug 8, 2026
Forecast Valid:
2am CDT Aug 8, 2026-6pm CDT Aug 14, 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