National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat Possible Next Week

A turn to hot and humid conditions is expected starting Monday. Dangerously hot conditions are possible through next week, particularly on Monday. Read More >

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

A Few Clouds

79°F

26°C

Humidity 51%
Wind Speed SE 7 mph
Barometer 29.98 in (1015.4 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 27 Jun 12:55 pm CDT
Extended Forecast for

Sparta WI

Extreme Heat Watch June 29, 12:00pm until June 30, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. Southeast wind around 8 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 59. East wind 3 to 6 mph.

    Low: 59 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 85. Breezy, with a southeast wind 8 to 16 mph, with gusts as high as 26 mph.

    High: 85 °F

    Mostly Sunny
    then Partly
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 72. Southeast wind 6 to 13 mph, with gusts as high as 24 mph.

    Low: 72 °F

    Chance
    T-storms

  • Monday

    Monday: Sunny, with a high near 94. Breezy, with a south wind 6 to 16 mph, with gusts as high as 25 mph.

    High: 94 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 75. South wind 6 to 14 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 94. South wind 6 to 14 mph, with gusts as high as 23 mph.

    High: 94 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 72. Southwest wind 5 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    Low: 72 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 92. South wind 5 to 9 mph, with gusts as high as 18 mph.

    High: 92 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 81. Southeast wind around 8 mph.
Tonight
Partly cloudy, with a low around 59. East wind 3 to 6 mph.
Sunday
Partly sunny, with a high near 85. Breezy, with a southeast wind 8 to 16 mph, with gusts as high as 26 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 72. Southeast wind 6 to 13 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 94. Breezy, with a south wind 6 to 16 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 75. South wind 6 to 14 mph, with gusts as high as 25 mph.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 94. South wind 6 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 72. Southwest wind 5 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 92. South wind 5 to 9 mph, with gusts as high as 18 mph.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind 3 to 5 mph. Winds could gust as high as 20 mph.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Southwest wind 3 to 7 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. Light south wind.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Calm wind becoming southwest around 5 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sparta WI
 43.93°N 90.81°W
Last Update:
12:23 pm CDT Jun 27, 2026
Forecast Valid:
1pm CDT Jun 27, 2026-6pm CDT Jul 3, 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