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.

Light Drizzle

59°F

15°C

Humidity 88%
Wind Speed N 6 mph
Barometer 29.93 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 21 Jun 8:55 pm CDT
Extended Forecast for

Sullivan WI

  • Tonight

    Tonight: A 40 percent chance of showers, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 55. East wind around 5 mph becoming calm.

    Low: 55 °F

    Chance
    Showers then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 74. Northeast wind 5 to 10 mph.

    High: 74 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50. Northeast wind around 5 mph becoming calm in the evening.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 76. Calm wind becoming east around 5 mph.

    High: 76 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 55. South wind around 5 mph becoming calm.

    Low: 55 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 76. Southwest wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 57. West wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 76. West wind 5 to 10 mph.

    High: 76 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

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

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of showers, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 55. East wind around 5 mph becoming calm.
Monday
Mostly sunny, with a high near 74. Northeast wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 50. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 76. Calm wind becoming east around 5 mph.
Tuesday Night
A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 55. South wind around 5 mph becoming calm.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 76. Southwest wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 57. West wind around 5 mph becoming calm in the evening.
Thursday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 76. West wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 77.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 56.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 79.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sullivan WI
 43.02°N 88.6°W (Elev. 846 ft)
Last Update:
8:32 pm CDT Jun 21, 2026
Forecast Valid:
9pm CDT Jun 21, 2026-6pm CDT Jun 28, 2026
 
Forecast Discussion
 
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Additional Resources

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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