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.

Fog/Mist

50°F

10°C

Humidity 98%
Wind Speed Calm
Barometer 29.91 in (1013.1 mb)
Dewpoint 49°F (9°C)
Visibility 2.00 mi
Last update 20 Jun 12:55 am CDT
Extended Forecast for

3 Miles SW Ontario WI

  • Overnight

    Overnight: Clear, with a low around 52. West wind around 8 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 75. Northwest wind 7 to 13 mph.

    High: 75 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 52. Northwest wind around 6 mph becoming calm in the evening.

    Low: 52 °F

    Partly Cloudy

  • Sunday

    Sunday: A 10 percent chance of showers after 5pm. Mostly cloudy, with a high near 74. Calm wind becoming east 5 to 7 mph in the morning.

    High: 74 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: A 10 percent chance of showers before 7pm. Mostly cloudy, with a low around 52. Northeast wind around 6 mph becoming calm in the evening.

    Low: 52 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 76. North wind 3 to 5 mph.

    High: 76 °F

    Mostly Sunny

  • Monday Night

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

    Low: 52 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 77. Calm wind.

    High: 77 °F

    Mostly Sunny
    then 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

Detailed Forecast

Overnight
Clear, with a low around 52. West wind around 8 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 75. Northwest wind 7 to 13 mph.
Saturday Night
Partly cloudy, with a low around 52. Northwest wind around 6 mph becoming calm in the evening.
Sunday
A 10 percent chance of showers after 5pm. Mostly cloudy, with a high near 74. Calm wind becoming east 5 to 7 mph in the morning.
Sunday Night
A 10 percent chance of showers before 7pm. Mostly cloudy, with a low around 52. Northeast wind around 6 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 76. North wind 3 to 5 mph.
Monday Night
Partly cloudy, with a low around 52. Calm wind.
Tuesday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 77. 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. Mostly sunny, with a high near 75. Light and variable wind becoming west 5 to 7 mph in the morning.
Wednesday Night
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. Mostly sunny, with a high near 76. Light north wind.
Thursday Night
Partly cloudy, with a low around 53. Calm wind.
Friday
Mostly sunny, with a high near 78. Calm wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Ontario WI
 43.71°N 90.64°W
Last Update:
12:06 am CDT Jun 20, 2026
Forecast Valid:
1am CDT Jun 20, 2026-6pm CDT Jun 26, 2026
 
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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