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Heavy Rain in the Appalachians and Central Gulf Coast; Heat Continues in the West; Monitoring the Tropics

Heavy to excessive rainfall over the southern Appalachians and portions of the central Gulf Coast may bring areas of flooding today. Hot temperatures are in place through today across much of the western U.S. and New England. Tropical Storm Erin is forecast to become a Major Hurricane this weekend as it moves across the central Atlantic Ocean. Monitor future forecasts for any East Coast impacts. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago / Wheeling, Pal-Waukee Airport (KPWK)

Lat: 42.12°NLon: 87.9°WElev: 646ft.

Thunderstorm in Vicinity

84°F

29°C

Humidity 65%
Wind Speed S 7 mph
Barometer 29.94 in (1013.3 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 12 Aug 12:52 pm CDT
Extended Forecast for

Crystal Lake IL

  • This Afternoon

    This Afternoon: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. West southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64. West wind around 5 mph, with gusts as high as 15 mph.

    Low: 64 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 82. North northwest wind around 5 mph, with gusts as high as 10 mph.

    High: 82 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60. North northwest wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 81. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. West southwest wind around 10 mph, with gusts as high as 20 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64. West wind around 5 mph, with gusts as high as 15 mph.
Wednesday
Sunny, with a high near 82. North northwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday Night
Mostly clear, with a low around 60. North northwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 81. Calm wind becoming east northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 61.
Friday
Sunny, with a high near 86.
Friday Night
Mostly clear, with a low around 70.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
Partly cloudy, with a low around 71.
Sunday
Partly sunny, with a high near 85.
Sunday Night
Mostly cloudy, with a low around 67.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Crystal Lake IL
 42.23°N 88.33°W
Last Update:
12:41 pm CDT Aug 12, 2025
Forecast Valid:
1pm CDT Aug 12, 2025-6pm CDT Aug 18, 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