September 2021 Climate Summary

Overview & Graphics
Monthly Summary
Events

Overview & Graphics

Aside from an impactful severe weather event on September 7th, most of September 2021 was quiet and much drier than normal, with the exception of a small portion of east central Illinois into west central Indiana. Temperatures averaged well above normal, with the month ranking as a top 10 warmest September at both Chicago and Rockford.

September 2021 Temperature and Precipitation Summary

Chicago and Rockford Monthly Summary

Public Information Statement...CORRECTED
National Weather Service Chicago IL
644 PM CDT Fri Oct 1 2021 /744 PM EDT Fri Oct 1 2021/

...A Look Back at the Climate for the Month of September 2021 for
Chicago and Rockford...

At Chicago, the average high temperature was 79.8 degrees, which
is 4.3 degrees above normal. The average low temperature was 60.7
degrees, which is 3.6 degrees above normal. The average temperature
for the month was 70.3 degrees, which is 4.0 degrees above normal.
During the month of September, 1.23 inches of precipitation were
recorded, which is 1.96 inches below normal.

There were no daily records set for Chicago during the month of
September 2021.

One top ten monthly record:
** Tied with 1925 for 5th warmest September on record since 1871.


At Rockford, the average high temperature was 82.7 degrees, which
is 7.4 degrees above normal. The average low temperature was 55.2
degrees, which is 1.7 degrees above normal. The average temperature
for the month was 68.9 degrees, which is 4.5 degrees above normal.
During the month of September, 0.53 inches of precipitation were
recorded, which is 3.09 inches below normal.

There were 2 daily records set for Rockford during the month of
September 2021:
* Tied daily maximum temperature of 93 degrees on the 19th.
* Record daily maximum temperature of 90 degrees on the 27th.

Two top ten monthly records:
** 7th warmest September on record since 1905.
** 7th driest September on record since 1905.

$$

- Izzi

Latest Monthly Climate Report: Chicago | Rockford

Events

September 7, 2021: Swaths of large hail and wind damage across northern IL

NWS Chicago Science and Past Events Page