| < September >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Average Daylight per day
|Sun altitude at solar noon on the 21st day.
- The average temperature in Chicago/ 0’Hare, Il in September is somewhat warm at 18 °C (64.4 °F).
- Afternoons can be fairly hot with average high temperatures reaching 23.8 °C (74.8 °F).
- Overnight temperatures are generally quite mild with an average low of 12.2 °C (54 °F).
- In September the range/ variation of diurnal average temperatures is 11.6 °C (20.9 °F).
- The weather in September is hardly arid. Circa 97mm (3.8in) of water falls.
- The shortest day is 11:44 long and the longest day is 13:07 long with an average length of 12:26.
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Weather Trend Graph for September in Chicago/ 0’Hare, Il, Usa
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