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

Hazardous Weather Conditions

Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Fair

94°F

34°C

Humidity 57%
Wind Speed S 15 G 23 mph
Barometer 29.72 in (1005.9 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index108°F (42°C)
Last update 29 Jun 4:55 pm CDT
Extended Forecast for

Westby WI

Extreme Heat Warning June 29, 05:18pm until July 1, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 29, 05:18pm until July 1, 07:00pm

    NOW until 7:00pm Wed

    Extreme Heat Warning

  • Tonight

    Low: 75 °F

    Mostly Clear
    and Breezy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 92. Heat index values as high as 102. South wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 92 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 72. Southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    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 90. Heat index values as high as 96. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 90 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 71. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 71 °F

    Showers

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 8 to 10 mph, with gusts as high as 20 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 69. South wind 3 to 6 mph. Chance of precipitation is 80%.

    Low: 69 °F

    Showers

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Southwest wind 6 to 8 mph.

    High: 86 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between 1am and 3am. Partly cloudy, with a low around 75. Breezy, with a south wind 10 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 92. Heat index values as high as 102. South wind 10 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 72. Southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 90. Heat index values as high as 96. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.
Wednesday Night
Showers and possibly a thunderstorm. Low around 71. Southwest wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 8 to 10 mph, with gusts as high as 20 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and possibly a thunderstorm. Low around 69. South wind 3 to 6 mph. Chance of precipitation is 80%.
Friday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Southwest wind 6 to 8 mph.
Friday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. Southwest wind around 6 mph becoming calm in the evening.
Independence Day
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South wind 3 to 6 mph. Chance of precipitation is 60%.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind around 6 mph becoming light and variable in the evening.
Sunday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Northwest wind around 7 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. Northwest wind around 6 mph becoming calm in the evening.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82. Northwest wind 3 to 7 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Westby WI
 43.65°N 90.86°W
Last Update:
1:26 pm CDT Jun 29, 2026
Forecast Valid:
5pm CDT Jun 29, 2026-6pm CDT Jul 6, 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