National Weather Service

News Headlines

August 11, 2026: Powerful Morning Derecho Produces Widespread Wind Damage and Tornadoes Across Northern Illinois and Northwest Indiana

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

59°F

15°C

Humidity	96%
Wind Speed	Calm
Barometer	30.09 in (1018.1 mb)
Dewpoint	58°F (14°C)
Visibility	10.00 mi
Last update	20 Aug 11:51 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Round Lake Beach IL

Overnight
Low: 58 °F
Partly Cloudy
Friday
High: 80 °F
Partly Sunny
then Chance
T-storms
Friday Night
Low: 62 °F
T-storms
Likely then
Mostly Cloudy
Saturday
High: 78 °F
Mostly Sunny
Saturday Night
Low: 57 °F
Mostly Clear
Sunday
High: 75 °F
Sunny
Sunday Night
Low: 55 °F
Partly Cloudy
Monday
High: 76 °F
Mostly Sunny
Monday Night
Low: 58 °F
Partly Cloudy

Detailed Forecast

Overnight

Partly cloudy, with a low around 58. Calm wind becoming west southwest around 5 mph.

Friday

A 30 percent chance of showers and thunderstorms, mainly after 2pm. Partly sunny, with a high near 80. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

Friday Night

Showers and thunderstorms likely, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 62. South southwest wind around 5 mph becoming west northwest after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday

Mostly sunny, with a high near 78. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

Saturday Night

Mostly clear, with a low around 57. North northwest wind 5 to 10 mph.

Sunday

Sunny, with a high near 75.

Sunday Night

Partly cloudy, with a low around 55.

Monday

Mostly sunny, with a high near 76.

Monday Night

Partly cloudy, with a low around 58.