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Chicago, United States
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September · climate normalsWarm days and a month score of 75/100

Chicago in September

Good · 75/100Beach 67/100
High / low75° / 59°daily averages
Precipitation3.5 in10 wet days
Sea68°surface temperature
41.85° N, 87.65° WElevation 587 ftUTC−5 · Central Daylight Time
When to goChicago · weather score
JanFebMarAprMayJunJulAugSepOctNovDec75September
Best timeMay · Sep–Oct
September: high / low75° / 59°
iWhat to expect

The weather in September

In September, Chicago averages daytime highs of 75° and night-time lows of 59° — warm weather by day. Expect around 3.5 in of precipitation spread over about 10 wet days, with average cloud cover near 30%.

Days are 3.7° cooler than in August on average, and October is cooler again by about 7.1°. The sea averages 68°, pleasant for a swim.

September scores 75/100 — good conditions for sightseeing — and ranks 1st of the twelve months for Chicago.

Around the middle of the month the sun rises at 06:31 and sets at 19:02 local time, giving 12 h 30 min of daylight. Days shorten by 80 minutes over the month.

Why 75/100?

How the score for September is built
Comfort · 42%100%
Dry days · 33%26%
Clear skies · 25%100%

Beach score this month: 67/100 (adds sea temperature and heat).

Comfort peaks for daytime highs between 18° and 25°C (64–77°F).

iiIn context

September against the year

Full climate guide
31
Jan
33
Feb
31
Mar
43
Apr
65
May
64
Jun
57
Jul
60
Aug
75
Sep
65
Oct
32
Nov
29
Dec
iiiNearby in September

Around Chicago this month

Evanston
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Evanston

Illinois · 13 mi N
75°Sep high
10wet days
75score
Evanston
Cicero
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Cicero

Illinois · 5.4 mi W
76°Sep high
10wet days
75score
Cicero
Oak Park
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Oak Park

Illinois · 7.3 mi W
76°Sep high
10wet days
75score
Oak Park
Berwyn
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Berwyn

Illinois · 7.4 mi W
76°Sep high
10wet days
75score
Berwyn
ivTop of the table

United States's best in September

Where to go in September
San Francisco
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1

San Francisco

California
71°Sep high
1wet day
99score
San Francisco
Oakland
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2

Oakland

California
76°Sep high
1wet day
99score
Oakland
Salinas
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3

Salinas

California
76°Sep high
1wet day
99score
Salinas
Ellensburg
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4

Ellensburg

Washington
77°Sep high
3wet days
93score
Ellensburg
·Questions

Chicago in September: quick answers

Is September a good time to visit Chicago?

September scores 75/100 for Chicago, which we rate as good. Average highs are 75°F with 10 wet days.

How warm is Chicago in September?

Daytime highs average 75°F and night-time lows 59°F in September.

Does it rain a lot in Chicago in September?

Chicago receives about 3.5 in of precipitation in September, falling on around 10 days.

Can you swim in Chicago in September?

The sea averages 68°F in September, refreshing but swimmable.