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.

Fair

59°F

15°C

Humidity 85%
Wind Speed Calm
Barometer 29.98 in (1015.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 24 May 9:55 pm CDT
Extended Forecast for

3 Miles ESE Ontario WI

  • Tonight

    Tonight: Partly cloudy, with a low around 57. South wind around 6 mph.

    Low: 57 °F

    Partly Cloudy

  • Memorial Day

    Memorial Day: A 40 percent chance of showers, mainly before noon. Mostly cloudy, then gradually becoming sunny, with a high near 83. South wind 5 to 15 mph, with gusts as high as 24 mph.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. South wind 5 to 9 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. Southwest wind around 6 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 60. Calm wind.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. Calm wind becoming east around 5 mph after midnight.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 82. East wind around 5 mph.

    High: 82 °F

    Sunny

  • Thursday Night

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

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 57. South wind around 6 mph.
Memorial Day
A 40 percent chance of showers, mainly before noon. Mostly cloudy, then gradually becoming sunny, with a high near 83. South wind 5 to 15 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 61. South wind 5 to 9 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 88. Southwest wind around 6 mph.
Tuesday Night
Mostly clear, with a low around 60. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. Calm wind.
Wednesday Night
Partly cloudy, with a low around 56. Calm wind becoming east around 5 mph after midnight.
Thursday
Sunny, with a high near 82. East wind around 5 mph.
Thursday Night
Partly cloudy, with a low around 54. Calm wind.
Friday
Mostly sunny, with a high near 80. Calm wind becoming southeast around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 55. Calm wind.
Saturday
Mostly sunny, with a high near 78. Calm wind becoming east around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 54. Light east wind.
Sunday
Mostly sunny, with a high near 78. Calm wind becoming east around 6 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Ontario WI
 43.71°N 90.53°W
Last Update:
6:07 pm CDT May 24, 2026
Forecast Valid:
10pm CDT May 24, 2026-6pm CDT May 31, 2026
 
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Additional Resources

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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