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August 11, 2026: Derecho produces widespread wind damage and tornadoes across northern Illinois and northwest Indiana

Hazardous Weather Conditions

Current conditions at

Lansing Municipal Airport (KIGQ)

Lat: 41.54°NLon: 87.53°WElev: 607ft.

N/A

Humidity	NA
Wind Speed	NA
Barometer	NA
Dewpoint	N/A
Visibility	NA
Last update	* Not a current observation *

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

South Chicago Heights IL

Flood Watch until August 15, 10:00am

Click here for hazard details and duration

Flood Watch

Flood Watch until August 15, 10:00am
NOW until 10:00am Sat
Flood Watch
Overnight
Low: 71 °F
Showers
Likely
Saturday
High: 81 °F
Heavy Rain
then Showers
Likely
Saturday Night
Low: 72 °F
Slight Chance
Showers then
Chance
T-storms
Sunday
High: 84 °F
Chance
T-storms
Sunday Night
Low: 67 °F
Partly Cloudy
Monday
High: 80 °F
Mostly Sunny
Monday Night
Low: 62 °F
Partly Cloudy
Tuesday
High: 81 °F
Mostly Sunny

Detailed Forecast

Overnight

A slight chance of showers before 2am, then a chance of showers and thunderstorms between 2am and 4am, then showers likely and possibly a thunderstorm after 4am. Cloudy, with a low around 71. East southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Saturday

Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Some of the storms could produce heavy rainfall. High near 81. South southeast wind 5 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Saturday Night

A slight chance of showers, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 72. Southwest wind around 5 mph. Chance of precipitation is 30%.

Sunday

A chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 84. West northwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 40%.

Sunday Night

Partly cloudy, with a low around 67. North northwest wind 5 to 10 mph.

Monday

Mostly sunny, with a high near 80.

Monday Night

Partly cloudy, with a low around 62.

Tuesday

Mostly sunny, with a high near 81.

Tuesday Night

A chance of showers after 1am. Mostly cloudy, with a low around 67.

Wednesday

A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78.