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August 11, 2026: Derecho produces widespread wind damage and tornadoes across northern Illinois and northwest Indiana
Interactive map of preliminary storm reports from this week's severe weather and flooding
NOAA All Hazards Radio Test Postponed

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

Markham IL

Dense Fog Advisory until August 13, 09:00am

Click here for hazard details and duration

Dense Fog Advisory

Dense Fog Advisory until August 13, 09:00am
NOW until 9:00am Thu
Dense Fog Advisory
Overnight
Low: 68 °F
Patchy Fog
Thursday
High: 80 °F
Patchy Fog
then Showers
Likely
Thursday Night
Low: 68 °F
Showers
Likely
Friday
High: 80 °F
Showers
Likely then
Chance
Showers
Friday Night
Low: 69 °F
Chance
T-storms then
Showers
Likely
Saturday
High: 85 °F
Showers
Likely
Saturday Night
Low: 73 °F
Chance
T-storms then
Showers
Likely
Sunday
High: 85 °F
Mostly Cloudy
then Chance
T-storms

Detailed Forecast

Overnight

Patchy fog. Otherwise, partly cloudy, with a low around 68. Southwest wind around 5 mph becoming calm.

Thursday

A chance of showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then a chance of showers and thunderstorms after 4pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 80. East wind 5 to 10 mph becoming north in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 9pm. Cloudy, with a low around 68. East wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

Friday

Showers and thunderstorms likely before 5pm, then a chance of showers. Mostly cloudy, with a high near 80. East northeast wind 5 to 10 mph. Chance of precipitation is 70%.

Friday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. East northeast wind 5 to 10 mph. Chance of precipitation is 60%.

Saturday

Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.

Saturday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.

Sunday

A chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85.

Sunday Night

A chance of showers before 1am. Mostly cloudy, with a low around 68.

Monday

Mostly sunny, with a high near 78.

Monday Night

Mostly clear, with a low around 62.

Tuesday

Mostly sunny, with a high near 79.

Tuesday Night

Partly cloudy, with a low around 65.