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.

Mostly Cloudy

59°F

15°C

Humidity 82%
Wind Speed Calm
Barometer 30.05 in (1017.9 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 14 Jun 7:55 am CDT
Extended Forecast for

Ontario WI

  • Today

    Today: Partly sunny, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 78 °F

    Partly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. Calm wind becoming south around 5 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm before 10pm, then showers and thunderstorms likely, mainly between 10pm and 1am. Mostly cloudy, with a low around 64. Light south wind. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 64 °F

    T-storms
    Likely

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84. Southwest wind 3 to 6 mph.

    High: 84 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 63. Light southwest wind. Chance of precipitation is 70%.

    Low: 63 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. Light and variable wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 70%.

    High: 79 °F

    Showers
    Likely

Detailed Forecast

Today
Partly sunny, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 59. Calm wind.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. Calm wind becoming south around 5 mph in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Calm wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers likely and possibly a thunderstorm before 10pm, then showers and thunderstorms likely, mainly between 10pm and 1am. Mostly cloudy, with a low around 64. Light south wind. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84. Southwest wind 3 to 6 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 63. Light southwest wind. Chance of precipitation is 70%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. Light and variable wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 70%.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60. Northwest wind 5 to 7 mph becoming calm after midnight.
Juneteenth
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 81. West wind 3 to 7 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 59. Light and variable wind.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. Light southwest wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 18 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario WI
 43.73°N 90.58°W
Last Update:
7:43 am CDT Jun 14, 2025
Forecast Valid:
8am CDT Jun 14, 2025-6pm CDT Jun 20, 2025
 
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