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September 1-4, 2026: Abnormally Hot and Humid Start to September

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

67°F

19°C

Humidity	79%
Wind Speed	S 3 mph
Barometer	30.16 in (1020.4 mb)
Dewpoint	60°F (16°C)
Visibility	10.00 mi
Last update	8 Sep 7:51 am CDT

More Information:

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

Extended Forecast for

Round Lake Park IL

Today
High: 83 °F
Partly Sunny
Tonight
Low: 70 °F
Mostly Cloudy
then Chance
Showers
Wednesday
High: 80 °F
Showers
Wednesday Night
Low: 60 °F
Partly Cloudy
Thursday
High: 77 °F
Mostly Sunny
Thursday Night
Low: 54 °F
Mostly Clear
Friday
High: 80 °F
Sunny
Friday Night
Low: 62 °F
Partly Cloudy
Saturday
High: 81 °F
Chance
Showers

Detailed Forecast

Today

Partly sunny, with a high near 83. South wind 5 to 10 mph, with gusts as high as 15 mph.

Tonight

A chance of showers and thunderstorms. Increasing clouds, with a low around 70. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 40%.

Wednesday

Showers and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. High near 80. West southwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

Partly cloudy, with a low around 60. West southwest wind around 5 mph becoming northwest after midnight.

Thursday

Mostly sunny, with a high near 77. North wind 5 to 10 mph.

Thursday Night

Mostly clear, with a low around 54.

Friday

Sunny, with a high near 80.

Friday Night

Partly cloudy, with a low around 62.

Saturday

A chance of showers before 1pm. Partly sunny, with a high near 81.