National Weather Service

News Headlines

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

Hazardous Weather Conditions

Current conditions at

Marshall County Airport (KC75)

Lat: 41.02°NLon: 89.39°WElev: 545ft.

Fair

89°F

32°C

Humidity	61%
Wind Speed	S 3 mph
Barometer	29.91 in
Dewpoint	74°F (23°C)
Visibility	10.00 mi
Heat Index	98°F (37°C)
Last update	2 Sep 6:35 pm CDT

More Information:

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

Extended Forecast for

Hennepin IL

Extreme Heat Warning September 2, 06:48pm until September 4, 07:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning September 2, 06:48pm until September 4, 07:00pm
NOW until 7:00pm Fri
Extreme Heat Warning
Tonight
Low: 74 °F
Clear then
Slight Chance
T-storms
Thursday
High: 93 °F
Slight Chance
T-storms then
Sunny
Thursday Night
Low: 74 °F
Mostly Clear
Friday
High: 92 °F
Sunny
Friday Night
Low: 73 °F
Mostly Clear
then Chance
Showers
Saturday
High: 89 °F
Mostly Sunny
Saturday Night
Low: 69 °F
Partly Cloudy
Sunday
High: 86 °F
Mostly Sunny

Detailed Forecast

Tonight

A 10 percent chance of showers and thunderstorms after 5am. Mostly clear, with a low around 74. South wind 5 to 10 mph.

Thursday

A 10 percent chance of showers and thunderstorms before 7am. Sunny, with a high near 93. Heat index values as high as 101. Southwest wind around 5 mph.

Thursday Night

Mostly clear, with a low around 74. South wind around 5 mph becoming calm in the evening.

Friday

Sunny, with a high near 92. Heat index values as high as 101. Calm wind becoming southwest around 5 mph.

Friday Night

A 40 percent chance of showers after 1am. Mostly clear, with a low around 73.

Saturday

Mostly sunny, with a high near 89.

Saturday Night

Partly cloudy, with a low around 69.

Sunday

Mostly sunny, with a high near 86.