Chicago weather in September
September in Chicago averages 76°F by day and 59°F at night, with 2.8 inches of precipitation. It is the 4th-warmest and 7th-wettest month of the year here.
- Average high
- 76°F-6° vs August
- Average low
- 59°F0 nights below freezing
- Precipitation
- 2.8 in5 days with 0.1 in. or more
- Snow
- 0.0 in2 days at 90°F+
Is September a good time to visit Chicago?
Yes. September is one of the most comfortable months in Chicago by our rule (highs of 62 to 86°F, lows of 42°F or more and under 4.5 inches of precipitation). The most comfortable months overall are May to October.
Get outside in Chicago in September
September is made for being outside. Try Millennium Park, Grant Park, Lincoln Park. All things to do in Chicago.
On September 15 the sun rises at 6:31 am and sets at 6:59 pm, giving 12h 29m of daylight. Daylight all year.
What to pack for Chicago in September
- Summer clothes, with a light layer for air conditioning
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| Chicago | 76°F | 59°F | 2.8 in | |
| Cicero, IL | 4 mi | 76°F | 59°F | 2.8 in |
| Evanston, IL | 14 mi | 76°F | 57°F | 3.2 in |
| Hammond, IN | 20 mi | 76°F | 55°F | 3.4 in |
| Arlington Heights, IL | 22 mi | 76°F | 57°F | 3.2 in |
| Naperville, IL | 24 mi | 78°F | 54°F | 3.3 in |
| Schaumburg, IL | 24 mi | 76°F | 57°F | 3.2 in |
Frequently asked questions
What is the weather like in Chicago in September?
In September, Chicago averages a high of 76°F and a low of 59°F, with 2.8 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit Chicago?
Yes. September is one of Chicago's most comfortable months by our rule: highs between 62°F and 86°F, lows of 42°F or more and modest rain.
Does it snow in Chicago in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: Chicago in August and Chicago in October. All twelve months: Chicago weather by month.
NOAA NCEI 1991-2020 climate normals, station Chicago Midway Airport, IL, 5.6 miles from the city center; snowfall from Chicago Midway Airport 3Sw, IL.