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

Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Overcast

71°F

22°C

Humidity 68%
Wind Speed S 8 mph
Barometer 30.01 in (1015.4 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 25 Jul 8:51 am CDT
Extended Forecast for

Round Lake ILSimilar City Names

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 78 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 70. Southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 70 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90. Heat index values as high as 100. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
Mostly cloudy, with a low around 70. Southwest wind around 5 mph, with gusts as high as 10 mph.
Sunday
Mostly sunny, with a high near 90. Heat index values as high as 100. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Monday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Sunny, with a high near 84.
Wednesday Night
Mostly clear, with a low around 63.
Thursday
Mostly sunny, with a high near 86.
Thursday Night
Partly cloudy, with a low around 65.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Round Lake ILSimilar City Names
 42.35°N 88.11°W
Last Update:
7:40 am CDT Jul 25, 2026
Forecast Valid:
9am CDT Jul 25, 2026-6pm CDT Jul 31, 2026
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

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Chance of Precipitation