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

Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Current conditions at

Chicago, Chicago Midway Airport (KMDW)

Lat: 41.78°NLon: 87.76°WElev: 617ft.

Partly Cloudy

65°F

18°C

Humidity 76%
Wind Speed S 6 mph
Barometer 30.04 in (1016.3 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 25 Jul 5:53 am CDT
Extended Forecast for

Lyons IL

  • Today

    Today: Mostly cloudy, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 78 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 72. South southwest wind 5 to 10 mph.

    Low: 72 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 91. Heat index values as high as 99. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 91 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 79 °F

    Chance
    T-storms

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 94 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
Mostly cloudy, with a low around 72. South southwest wind 5 to 10 mph.
Sunday
Partly sunny, with a high near 91. Heat index values as high as 99. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 79. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Monday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Monday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Mostly clear, with a low around 69.
Thursday
Mostly sunny, with a high near 87.
Thursday Night
Partly cloudy, with a low around 70.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lyons IL
 41.82°N 87.83°W
Last Update:
3:06 am CDT Jul 25, 2026
Forecast Valid:
6am CDT Jul 25, 2026-6pm CDT Jul 31, 2026
 
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