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

Heavy to Excessive Rainfall for the Southwest; Thunderstorms in Florida with Flooding Possible

Tropical moisture from Priscilla will bring a multi-day thunderstorm, widespread heavy rainfall and flash flooding event across the Southwest/Four Corners region. Flash flooding will be a concern in burn scars, slot canyons, and urban areas. Widespread storms are expected in central/South Florida with some isolated flash flooding possible. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Mostly Cloudy

56°F

13°C

Humidity 55%
Wind Speed S 7 mph
Barometer 30.50 in (1033.0 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 9 Oct 9:51 am CDT
Extended Forecast for

Grayslake IL

  • Today

    Today: Sunny, with a high near 62. Southeast wind 5 to 10 mph.

    High: 62 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 43. East southeast wind around 5 mph becoming south after midnight.

    Low: 43 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 66. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 66 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 1am. Partly cloudy, with a low around 44. West southwest wind 5 to 10 mph becoming northwest in the evening.

    Low: 44 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 65. West northwest wind 5 to 10 mph becoming north northeast in the afternoon.

    High: 65 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Columbus Day

    Columbus Day: Partly sunny, with a high near 74.

    High: 74 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 62. Southeast wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 43. East southeast wind around 5 mph becoming south after midnight.
Friday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 66. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Friday Night
A 30 percent chance of showers before 1am. Partly cloudy, with a low around 44. West southwest wind 5 to 10 mph becoming northwest in the evening.
Saturday
Mostly sunny, with a high near 65. West northwest wind 5 to 10 mph becoming north northeast in the afternoon.
Saturday Night
Mostly clear, with a low around 45.
Sunday
Mostly sunny, with a high near 64.
Sunday Night
Mostly cloudy, with a low around 54.
Columbus Day
Partly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 53.
Tuesday
Mostly sunny, with a high near 69.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.33°N 88.03°W
Last Update:
10:46 am CDT Oct 9, 2025
Forecast Valid:
10am CDT Oct 9, 2025-6pm CDT Oct 15, 2025
 
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