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

73°F

23°C

Humidity 54%
Wind Speed Calm
Barometer 29.88 in (1012.1 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 21 Jun 1:55 pm CDT
Extended Forecast for

2 Miles SSE Ontario WI

  • This Afternoon

    This Afternoon: A 30 percent chance of showers, mainly after 5pm. Mostly cloudy, with a high near 74. Light east wind.

    High: 74 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 7pm. Mostly cloudy, with a low around 52. Calm wind.

    Low: 52 °F

    Chance
    Showers then
    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 78. Light north wind.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52. Calm wind.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 78. Calm wind. Chance of precipitation is 30%.

    High: 78 °F

    Sunny then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 58. Calm wind. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 58 °F

    Showers
    Likely then
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 77. Southwest wind 3 to 6 mph. Chance of precipitation is 70%.

    High: 77 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 75. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers, mainly after 5pm. Mostly cloudy, with a high near 74. Light east wind.
Tonight
A 30 percent chance of showers, mainly before 7pm. Mostly cloudy, with a low around 52. Calm wind.
Monday
Sunny, with a high near 78. Light north wind.
Monday Night
Mostly clear, with a low around 52. Calm wind.
Tuesday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 78. Calm wind. Chance of precipitation is 30%.
Tuesday Night
Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 58. Calm wind. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 77. Southwest wind 3 to 6 mph. Chance of precipitation is 70%.
Wednesday Night
Partly cloudy, with a low around 54. Calm wind.
Thursday
Mostly sunny, with a high near 75. Calm wind becoming northwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 53. Calm wind.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 77. Calm wind.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 57. Calm wind.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 80. Calm wind becoming southeast 5 to 7 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Ontario WI
 43.71°N 90.58°W
Last Update:
1:51 pm CDT Jun 21, 2026
Forecast Valid:
2pm CDT Jun 21, 2026-6pm CDT Jun 27, 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