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.

Partly Cloudy

57°F

14°C

Humidity 95%
Wind Speed Calm
Barometer 29.91 in (1013.1 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 19 Jun 10:55 pm CDT
Extended Forecast for

3 Miles S Ontario WI

  • Overnight

    Overnight: Mostly clear, with a low around 51. Light and variable wind becoming west 5 to 8 mph. Winds could gust as high as 18 mph.

    Low: 51 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 76. Northwest wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 51. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 51 °F

    Partly Cloudy

  • Sunday

    Sunday: A 10 percent chance of showers after 5pm. Mostly cloudy, with a high near 73. Calm wind becoming east 5 to 8 mph in the morning.

    High: 73 °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 77. Light north wind.

    High: 77 °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
Mostly clear, with a low around 51. Light and variable wind becoming west 5 to 8 mph. Winds could gust as high as 18 mph.
Saturday
Sunny, with a high near 76. Northwest wind 7 to 11 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 51. Northwest wind 5 to 7 mph becoming calm in the evening.
Sunday
A 10 percent chance of showers after 5pm. Mostly cloudy, with a high near 73. Calm wind becoming east 5 to 8 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 77. Light north wind.
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 76. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 52. Light northwest wind.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77. Calm wind.
Thursday Night
Partly cloudy, with a low around 53. Calm wind.
Friday
Mostly sunny, with a high near 79. Calm wind.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Ontario WI
 43.69°N 90.59°W
Last Update:
12:06 am CDT Jun 20, 2026
Forecast Valid:
12am 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