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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

64°F

18°C

Humidity 96%
Wind Speed Calm
Barometer 30.05 in (1016.8 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 27 Aug 9:51 pm CDT
Extended Forecast for

Sunnyside IL

  • Tonight

    Tonight: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 82. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. South wind around 5 mph becoming calm.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 81. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 81 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 10pm. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Partly sunny, with a high near 86. Chance of precipitation is 20%.

    High: 86 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday

    Monday: Mostly cloudy, with a high near 87.

    High: 87 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 59. Calm wind.
Friday
Sunny, with a high near 82. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 61. South wind around 5 mph becoming calm.
Saturday
Increasing clouds, with a high near 81. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A chance of showers, with thunderstorms also possible after 10pm. Mostly cloudy, with a low around 67. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Sunday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm. Partly sunny, with a high near 86. Chance of precipitation is 20%.
Sunday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71.
Monday
Mostly cloudy, with a high near 87.
Monday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 69.
Thursday
A chance of showers. Mostly sunny, with a high near 85.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sunnyside IL
 42.38°N 88.26°W
Last Update:
9:56 pm CDT Aug 27, 2026
Forecast Valid:
10pm CDT Aug 27, 2026-6pm CDT Sep 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