September 2024 Climate Summary

Overview
Monthly Summary
Events

Overview

September 2024 featured above normal temperatures and ended up tying 1908 and 1960 for the 2nd warmest September on record in Chicago. The month was also fairly dry across the region, with Chicago and Rockford finishing with below normal precipitation totals.

September 2024 Climate Summary: Why Was it So Warm in Chicago in Particular?

Some context as to why September 2024 was so warm, particularly in the city of Chicago

CoCoRaHS Observer Monthly Precipitation Summary

Chicago and Rockford Monthly Summary

Public Information Statement
National Weather Service Chicago IL
846 AM CDT Tue Oct 1 2024 /946 AM EDT Tue Oct 1 2024/

...A Look Back at the Climate for the Month of September 2024 for
Chicago and Rockford...

At Chicago, the average high temperature was 80.3 degrees, which
is 4.8 degrees above normal. The average low temperature was
60.9 degrees, which is 3.8 degrees above normal. The average
temperature for the month was 70.6 degrees, which is 4.3 degrees
above normal. 1.32 inches of liquid precipitation were recorded,
which is 1.87 inches below normal.

No daily records were set for Chicago during this past September.

The following top ten monthly record was tied for Chicago this
past September:

** Tied second warmest September on record with 1908 and 1960.


At Rockford, the average high temperature was 80.7 degrees, which
is 5.4 degrees above normal. The average low temperature was
53.3 degrees, which is 0.2 degrees below normal. The average
temperature for the month was 67.0 degrees, which is 2.6 degrees
above normal. 2.05 inches of liquid precipitation were recorded,
which is 1.57 inches below normal.

No daily or top ten monthly records were set for Rockford during
this past September.

$$

Latest Monthly Climate Report: Chicago | Rockford

Events

September 27-28, 2024: Prolonged period of gusty northeast winds and large waves due to Helene's remnants

NWS Chicago Science and Past Events Page