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.

Overcast

73°F

23°C

Humidity 51%
Wind Speed Calm
Barometer 29.92 in (1013.5 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 20 Jun 5:55 pm CDT
Extended Forecast for

3 Miles ENE Ontario WI

  • Tonight

    Tonight: Mostly clear, with a low around 50. Northwest wind around 5 mph becoming calm in the evening.

    Low: 50 °F

    Mostly Clear

  • Sunday

    Sunday: A 30 percent chance of showers, mainly after 1pm. Partly sunny, with a high near 73. Calm wind becoming east around 6 mph in the afternoon.

    High: 73 °F

    Partly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before 8pm. Mostly cloudy, with a low around 52. Light northeast wind.

    Low: 52 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 76. Northeast wind 3 to 5 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 52. Light north wind.

    Low: 52 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 76. Calm wind.

    High: 76 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 55. Calm wind. Chance of precipitation is 80%.

    Low: 55 °F

    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 73. Calm wind becoming west around 6 mph in the morning.

    High: 73 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 52. Northwest wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 50. Northwest wind around 5 mph becoming calm in the evening.
Sunday
A 30 percent chance of showers, mainly after 1pm. Partly sunny, with a high near 73. Calm wind becoming east around 6 mph in the afternoon.
Sunday Night
A 20 percent chance of showers before 8pm. Mostly cloudy, with a low around 52. Light northeast wind.
Monday
Sunny, with a high near 76. Northeast wind 3 to 5 mph.
Monday Night
Partly cloudy, with a low around 52. Light north wind.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 76. Calm wind.
Tuesday Night
Showers and possibly a thunderstorm. Low around 55. Calm wind. Chance of precipitation is 80%.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 73. Calm wind becoming west around 6 mph in the morning.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 52. Northwest wind around 5 mph becoming calm in the evening.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Light northwest wind.
Thursday Night
Mostly clear, with a low around 53. Calm wind.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78. Calm wind.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 56. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80. Calm wind becoming southeast 5 to 7 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Ontario WI
 43.73°N 90.55°W
Last Update:
6:21 pm CDT Jun 20, 2026
Forecast Valid:
6pm CDT Jun 20, 2026-6pm CDT Jun 27, 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