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

Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago / Wheeling, Pal-Waukee Airport (KPWK)

Lat: 42.12°NLon: 87.9°WElev: 646ft.

Fair

77°F

25°C

Humidity 79%
Wind Speed NE 5 mph
Barometer 30.06 in (1017.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 16 Aug 5:52 am CDT
Extended Forecast for

Forest Lake IL

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Heat index values as high as 102. Southwest wind 5 to 10 mph.

    High: 91 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South wind around 5 mph becoming north in the evening. Winds could gust as high as 15 mph.

    Low: 70 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 80. Northeast wind 5 to 10 mph.

    High: 80 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70. Northeast wind around 5 mph becoming east southeast after midnight. Winds could gust as high as 10 mph.

    Low: 70 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 90 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Heat index values as high as 102. Southwest wind 5 to 10 mph.
Tonight
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South wind around 5 mph becoming north in the evening. Winds could gust as high as 15 mph.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 80. Northeast wind 5 to 10 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70. Northeast wind around 5 mph becoming east southeast after midnight. Winds could gust as high as 10 mph.
Monday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Tuesday Night
Mostly cloudy, with a low around 65.
Wednesday
Partly sunny, with a high near 76.
Wednesday Night
Mostly clear, with a low around 62.
Thursday
Sunny, with a high near 79.
Thursday Night
Clear, with a low around 62.
Friday
Sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Forest Lake IL
 42.22°N 88.03°W
Last Update:
5:56 am CDT Aug 16, 2025
Forecast Valid:
6am CDT Aug 16, 2025-6pm CDT Aug 22, 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