| < September >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Number of Wet Days (probability of rain on a day)
|Average Sunlight per day
|Average Daylight per day
|Sunny (Cloudy) Daylight Hours
|Sun altitude at solar noon on the 21st day.
- The average temperature in Chicago, Illinois in September is somewhat warm at 19 °C (66.2 °F).
- Afternoons can be fairly hot with average high temperatures reaching 24 °C (75.2 °F).
- Overnight temperatures are generally mild with an average low of 14 °C (57.2 °F).
- In September the average diurnal temperature variation/ range is 10 °C (18 °F).
- The weather in September is marginally dry with intermittent rain. Only 69mm (2.7in) of liquid is laid down during an average of 8 days.
- The heavens above Chicago, Illinois are slightly sunny with on balance a pleasing 7:56 of dazzling solar radiation daily.
- The shortest day is 11:44 long and the longest day is 13:07 long with an average length of 12:26.
- There are approximately 4:19 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
- It is sunny approximately 64.7% of daylight hours and cloudy 35.3% of daylight hours.
Check the distance to and compare the Chicago, Illinois September averages with somewhere beginning with:
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Weather Trend Graph for September in Chicago, Illinois, Usa
Navigate to September Weather in Locations Surrounding Chicago, Illinois:
- Racine, Wi, Usa - 104.9 kms (65.2 miles) N
- Rockford, Il, Usa - 120.8 kms (75.1 miles) WNW
- Marengo, Il, Usa - 106.2 kms (66 miles) WNW
- Aurora, Il, Usa - 31.8 kms (19.7 miles) NW
- Chicago/ 0'Hare, Il, Usa - 25.5 kms (15.8 miles) NNW