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August / Summer 2026 Climate Summary and Outlook for Sept / Fall

Hazardous Weather Conditions

Current conditions at

Sterling Rockfalls (KSQI)

Lat: 41.74°NLon: 89.67°WElev: 643ft.

Overcast

81°F

27°C

Humidity	82%
Wind Speed	Vrbl 5 mph
Barometer	29.94 in (1013.3 mb)
Dewpoint	75°F (24°C)
Visibility	10.00 mi
Heat Index	87°F (31°C)
Last update	3 Sep 8:56 am CDT

More Information:

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

Extended Forecast for

Walnut IL

Extreme Heat Warning September 3, 09:23am until September 4, 07:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning September 3, 09:23am until September 4, 07:00pm
NOW until 7:00pm Fri
Extreme Heat Warning
Today
High: 93 °F
Sunny
Tonight
Low: 74 °F
Mostly Clear
Friday
High: 93 °F
Sunny
Friday Night
Low: 72 °F
Mostly Clear
then Chance
T-storms
Saturday
High: 88 °F
Sunny
Saturday Night
Low: 67 °F
Mostly Clear
Sunday
High: 84 °F
Mostly Sunny
Sunday Night
Low: 64 °F
Partly Cloudy

Detailed Forecast

Today

Sunny, with a high near 93. Heat index values as high as 103. Southwest wind around 5 mph.

Tonight

Mostly clear, with a low around 74. South wind around 5 mph becoming east after midnight.

Friday

Sunny, with a high near 93. Heat index values as high as 105. East wind around 5 mph becoming southwest in the afternoon.

Friday Night

A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 72. Southwest wind around 5 mph becoming southeast after midnight.

Saturday

Sunny, with a high near 88.

Saturday Night

Mostly clear, with a low around 67.

Sunday

Mostly sunny, with a high near 84.

Sunday Night

Partly cloudy, with a low around 64.

Labor Day

Mostly sunny, with a high near 84.

Monday Night

Partly cloudy, with a low around 66.