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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

95°F

35°C

Humidity	46%
Wind Speed	W 5 mph
Barometer	29.90 in
Dewpoint	71°F (22°C)
Visibility	10.00 mi
Heat Index	103°F (39°C)
Last update	4 Sep 4:55 pm CDT

More Information:

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

Extended Forecast for

Putnam IL

Extreme Heat Warning September 4, 05:18pm until September 5, 07:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning September 4, 05:18pm until September 5, 07:00pm
NOW until 7:00pm Sat
Extreme Heat Warning
Tonight
Low: 73 °F
Partly Cloudy
then Slight
Chance
T-storms
Saturday
High: 92 °F
Sunny
Saturday Night
Low: 66 °F
Mostly Clear
Sunday
High: 84 °F
Sunny
Sunday Night
Low: 61 °F
Mostly Clear
Labor Day
High: 84 °F
Sunny
Monday Night
Low: 63 °F
Partly Cloudy
Tuesday
High: 91 °F
Mostly Sunny

Detailed Forecast

Tonight

A slight chance of showers and thunderstorms between 1am and 4am. Partly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

Saturday

Sunny, with a high near 92. Calm wind becoming north around 5 mph in the afternoon.

Saturday Night

Mostly clear, with a low around 66. Northeast wind 5 to 10 mph.

Sunday

Sunny, with a high near 84. East wind around 5 mph.

Sunday Night

Mostly clear, with a low around 61.

Labor Day

Sunny, with a high near 84.

Monday Night

Partly cloudy, with a low around 63.