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

Waukesha County Airport (KUES)

Lat: 43.04°NLon: 88.25°WElev: 886ft.

Fair

22°C

72°F

Humidity 78%
Wind Speed E 9 km/h
Barometer 30.14 in
Dewpoint 18°C (64°F)
Visibility 16 km
Last update 6 Sep 9:45 am CDT
Extended Forecast for

Sullivan WI

  • Today

    Today: Mostly sunny, with a high near 26. East wind around 10 km/h.

    High: 26 °C

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 14. Calm wind.

    Low: 14 °C

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 26. Southeast wind 5 to 15 km/h.

    High: 26 °C

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 16. Southeast wind 5 to 10 km/h.

    Low: 16 °C

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 29. South wind 10 to 15 km/h.

    High: 29 °C

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 22. South wind around 15 km/h. Chance of precipitation is 80%. New rainfall amounts between 5 and 7.5 mm possible.

    Low: 22 °C

    Chance
    Showers then
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 28. West wind 15 to 25 km/h, with gusts as high as 40 km/h.

    High: 28 °C

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14. West wind 10 to 15 km/h decreasing to 5 to 10 km/h after midnight.

    Low: 14 °C

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 25.

    High: 25 °C

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 26. East wind around 10 km/h.
Tonight
Mostly clear, with a low around 14. Calm wind.
Labor Day
Sunny, with a high near 26. Southeast wind 5 to 15 km/h.
Monday Night
Partly cloudy, with a low around 16. Southeast wind 5 to 10 km/h.
Tuesday
Partly sunny, with a high near 29. South wind 10 to 15 km/h.
Tuesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 22. South wind around 15 km/h. Chance of precipitation is 80%. New rainfall amounts between 5 and 7.5 mm possible.
Wednesday
Partly sunny, with a high near 28. West wind 15 to 25 km/h, with gusts as high as 40 km/h.
Wednesday Night
Partly cloudy, with a low around 14. West wind 10 to 15 km/h decreasing to 5 to 10 km/h after midnight.
Thursday
Mostly sunny, with a high near 25.
Thursday Night
Mostly clear, with a low around 13.
Friday
Mostly sunny, with a high near 26.
Friday Night
Partly cloudy, with a low around 14.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 27.
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan WI
 43°N 88.6°W (Elev. 846 m)
Last Update:
10:32 am CDT Sep 6, 2026
Forecast Valid:
10am CDT Sep 6, 2026-6pm CDT Sep 12, 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