Overview
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| September has come and gone, but was characterized with above normal temperatures and precipitation. |
CoCoRaHS Observer Monthly Precipitation Summary
Chicago Daily Climate Data for September 2026
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| Daily high and low temperatures observed at Chicago-O'Hare Airport in September 2026 plotted relative to the normal and record high and low temperatures for each date. |
Rockford Daily Climate Data for September 2026
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| Daily high and low temperatures observed at Rockford Airport in September 2026 plotted relative to the normal and record high and low temperatures for each date. |
September 2026 Climate Summary for Chicago and Rockford
Public Information Statement National Weather Service Chicago IL 548 AM CDT Thu Oct 1 2026 /648 AM EDT Thu Oct 1 2026/ ...A Look Back at the Climate for the Month of September 2026 for Chicago and Rockford... At Chicago, the average high temperature was 77.3 degrees, which is 1.8 degrees above normal. The average low temperature was 63.0 degrees, which is 5.9 degrees above normal. The mean average temperature for the month was 70.1 degrees, which is 3.8 degrees above normal. 3.70 inches of liquid precipitation were recorded, which is 0.51 inches above normal. The following daily records were set for Chicago this past September: * Tied record daily warmest low temperature of 78 degrees on the 2nd. * Record daily warmest low temperature of 77 degrees on the 3rd. * Record daily warmest low temperature of 76 degrees on the 4th. The following top ten monthly records were set for Chicago this past September: ** Tied 10th warmest September on record with an average temperature of 70.1 degrees. At Rockford, the average high temperature was 77.6 degrees, which is 2.3 degrees above normal. The average low temperature was 58.4 degrees, which is 4.9 degrees above normal. The average temperature for the month was 68.0 degrees, which is 3.6 degrees above normal. 7.40 inches of liquid precipitation were recorded, which is 3.78 inches above normal. The following daily records were set for Rockford this past September: * Tied record daily warmest low temperature of 73 degrees on the 3rd. * Record daily warmest low temperature of 73 degrees on the 4th. * Record daily liquid precipitation of 2.63 inches on the 19th. No top ten monthly records were set for Rockford during this past September. .................................................................. Chicago's climatic period of record dates back to: 1871 for precipitation 1872 for temperatures 1884 for snowfall Rockford's climatic period of record dates back to: 1905 for temperatures, precipitation, and snowfall $$
Latest Monthly Climate Report: Chicago (O'Hare) | Rockford
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