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

Areas of Dangerous Heat and Heavy Rainfall Today

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley today. Heat Advisories remain in effect. Heavy to excessive rainfall today could bring areas of flooding to parts of the northern High Plains and Midwest into the Ohio Valley. Flood Watches remain in effect. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago, Chicago Midway Airport (KMDW)

Lat: 41.78°NLon: 87.76°WElev: 617ft.

Light Rain

65°F

18°C

Humidity 97%
Wind Speed NE 15 mph
Barometer 29.97 in (1014.3 mb)
Dewpoint 64°F (18°C)
Visibility 7.00 mi
Last update 20 Sep 3:53 pm CDT
Extended Forecast for

Lyons IL

  • This Afternoon

    This Afternoon: Showers. Steady temperature around 64. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 64 °F

    Showers

  • Tonight

    Tonight: Showers likely with areas of drizzle before 10pm, then a chance of showers, mainly between 10pm and 4am. Cloudy, with a low around 59. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 59 °F

    Showers
    Likely then
    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers before 1pm. Cloudy, with a high near 64. East northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 56. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 64. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Showers. Steady temperature around 64. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers likely with areas of drizzle before 10pm, then a chance of showers, mainly between 10pm and 4am. Cloudy, with a low around 59. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
A 20 percent chance of showers before 1pm. Cloudy, with a high near 64. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, with a low around 56. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 64. Northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 54.
Thursday
Partly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 55.
Friday
Partly sunny, with a high near 68.
Friday Night
Mostly cloudy, with a low around 55.
Saturday
Partly sunny, with a high near 72.
Saturday Night
Mostly cloudy, with a low around 56.
Sunday
Partly sunny, with a high near 75.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lyons IL
 41.82°N 87.83°W
Last Update:
2:46 pm CDT Sep 20, 2026
Forecast Valid:
4pm CDT Sep 20, 2026-6pm CDT Sep 27, 2026
 
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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