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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Light Rain Fog/Mist

64°F

18°C

Humidity 96%
Wind Speed NE 13 G 20 mph
Barometer 30.00 in (1015.2 mb)
Dewpoint 63°F (17°C)
Visibility 4.00 mi
Last update 20 Sep 12:51 pm CDT
Extended Forecast for

Round Lake ILSimilar City Names

  • This Afternoon

    This Afternoon: Showers, mainly before 3pm. High near 65. Northeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 65 °F

    Showers

  • Tonight

    Tonight: A slight chance of showers between 7pm and 10pm. Cloudy, with a low around 55. East northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 55 °F

    Slight Chance
    Showers then
    Cloudy

  • Monday

    Monday: A 20 percent chance of showers. Cloudy, with a high near 64. Breezy, with an east northeast wind 15 to 20 mph, with gusts as high as 25 mph.

    High: 64 °F

    Slight Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 51. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 51 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 62 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Showers, mainly before 3pm. High near 65. Northeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
A slight chance of showers between 7pm and 10pm. Cloudy, with a low around 55. East northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Monday
A 20 percent chance of showers. Cloudy, with a high near 64. Breezy, with an east northeast wind 15 to 20 mph, with gusts as high as 25 mph.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 51. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, with a high near 62. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Partly sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 65.
Thursday Night
Mostly cloudy, with a low around 50.
Friday
Mostly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Partly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Round Lake ILSimilar City Names
 42.35°N 88.11°W
Last Update:
11:41 am CDT Sep 20, 2026
Forecast Valid:
1pm CDT Sep 20, 2026-6pm CDT Sep 26, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation