Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Overcast

31°F

-1°C

Humidity 89%
Wind Speed Calm
Barometer 30.00 in (1016.8 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 5 Mar 1:55 am CST
Extended Forecast for

Ontario WI

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 35. Calm wind.

    Low: 35 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 48. East wind 3 to 6 mph.

    High: 48 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 38. East wind around 5 mph becoming calm.

    Low: 38 °F

    Mostly Cloudy

  • Friday

    Friday: Showers, with thunderstorms also possible after 9am.  High near 64. Southeast wind 6 to 10 mph, with gusts as high as 20 mph.  Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 64 °F

    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm.  Low around 36. South wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 23 mph.  Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 36 °F

    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before noon.  Partly sunny, with a high near 50. Northwest wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 50 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 31. Calm wind becoming southwest 5 to 8 mph in the evening. Winds could gust as high as 21 mph.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 61. Southwest wind 9 to 15 mph, with gusts as high as 24 mph.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 35. Calm wind.
Thursday
Mostly cloudy, with a high near 48. East wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 38. East wind around 5 mph becoming calm.
Friday
Showers, with thunderstorms also possible after 9am. High near 64. Southeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Friday Night
Showers and possibly a thunderstorm. Low around 36. South wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday
A 20 percent chance of showers before noon. Partly sunny, with a high near 50. Northwest wind 6 to 14 mph, with gusts as high as 24 mph.
Saturday Night
Mostly clear, with a low around 31. Calm wind becoming southwest 5 to 8 mph in the evening. Winds could gust as high as 21 mph.
Sunday
Sunny, with a high near 61. Southwest wind 9 to 15 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 42. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.
Monday
Sunny, with a high near 67. Southwest wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Partly cloudy, with a low around 37. Light and variable wind becoming east around 6 mph after midnight.
Tuesday
Showers likely. Mostly sunny, with a high near 58. East wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Tuesday Night
Rain and snow showers likely. Mostly cloudy, with a low around 27. Northeast wind around 9 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Wednesday
A chance of rain and snow showers. Partly sunny, with a high near 45. Northwest wind 9 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Ontario WI
 43.73°N 90.58°W
12:26 am CST Mar 5, 2026
2am CST Mar 5, 2026-6pm CDT Mar 11, 2026
 
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Additional Resources

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