Chicago, Illinois Weather in September
United States · September climate averages and travel tips
Avg high22°C (72°F)
Avg low17°C (62°F)
Rainfall86 mm (3.4 in)
RatingExcellent 9/10
Expect warm days in Chicago in September: the average high is 22°C (72°F) and the average low is 17°C (62°F). September is autumn (fall) in United States. The month is moderately rainy, with about 86 mm (3.4 in) of rain spread over 10 days. You get roughly 12.3 hours of daylight and a mix of sun and cloud.
Is September a good time to visit Chicago?
Yes — September is one of the best months to visit Chicago. The weather rates excellent (9/10) on our comfort score.
September weather at a glance
| Average high | 22°C (72°F) |
|---|---|
| Average low | 17°C (62°F) |
| Daily mean | 20°C (67°F) |
| Rainfall | 86 mm (3.4 in) |
| Rainy days (1 mm+) | 10 |
| Humidity | 76% |
| Cloud cover | 47% |
| Daylight | 12.3 hours |
| Est. sunshine | 7.2 hours/day |
| Wind | 14.5 km/h |
| vs August | 3°C cooler than August, with 12 mm less rain. |
What to pack for Chicago in September
- T-shirts plus a light layer for the evening
- an umbrella or rain jacket
Chicago weather in other months
Jan0°C / -5°C53 mmPoorFeb0°C / -5°C56 mmPoorMar5°C / 0°C66 mmFairApr10°C / 4°C93 mmFairMay16°C / 9°C105 mmGoodJun22°C / 16°C105 mmGoodJul25°C / 20°C101 mmGoodAug25°C / 20°C98 mmGoodSep22°C / 17°C86 mmExcellentOct16°C / 10°C99 mmGoodNov9°C / 4°C53 mmFairDec3°C / -2°C62 mmPoor
← AugustBest time to visit ChicagoOctober →
Nearby in September
- Nashville, Tennessee29°C · 89 mm
- Toronto22°C · 62 mm
- Washington, D.C., District of Columbia27°C · 103 mm
- Ottawa22°C · 81 mm
- Philadelphia, Pennsylvania26°C · 101 mm
- New York23°C · 102 mm
Where else is good in September? See where to go in September.