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

Hazardous Weather Conditions

Current conditions at

Waukesha County Airport (KUES)

Lat: 43.04°NLon: 88.25°WElev: 886ft.

Fog/Mist

73°F

23°C

Humidity 89%
Wind Speed S 5 mph
Barometer 29.98 in
Dewpoint 70°F (21°C)
Visibility 2.50 mi
Last update 13 Aug 10:45 am CDT
Extended Forecast for

Sullivan WI

  • Today

    Today: Rain and thunderstorms likely, then rain and possibly a thunderstorm after 4pm. High near 78. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Rain

  • Tonight

    Tonight: A 40 percent chance of rain, mainly before 9pm. Mostly cloudy, with a low around 64. East wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Chance Rain

  • Friday

    Friday: A chance of showers before 1pm, then a slight chance of showers after 4pm. Mostly cloudy, with a high near 79. East wind 5 to 10 mph. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. East wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 65 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Southeast wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 81 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Southwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Showers
    Likely

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Northwest wind 5 to 10 mph.

    High: 80 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 62. North wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Today
Rain and thunderstorms likely, then rain and possibly a thunderstorm after 4pm. High near 78. East wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A 40 percent chance of rain, mainly before 9pm. Mostly cloudy, with a low around 64. East wind around 5 mph becoming calm in the evening.
Friday
A chance of showers before 1pm, then a slight chance of showers after 4pm. Mostly cloudy, with a high near 79. East wind 5 to 10 mph. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. East wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. Southeast wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Southwest wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80. Northwest wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 62. North wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 77.
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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:
10:56 am CDT Aug 13, 2026
Forecast Valid:
11am CDT Aug 13, 2026-6pm CDT Aug 19, 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