Measurements:
°C
°F
CURRENT WEATHER
07:56
Chicago
66°F
N 9 mph
Feels like: 66°F
Precip: 71%
World Resorts USA Chicago Weather

7 Day Weather Forecast

09.15
tue
DAY
74°F
N 11 mph
precip
61%
NIGHT
72°F
S 7 mph
precip
50%
09.16
wed
DAY
68°F
SW 10 mph
precip
64%
NIGHT
70°F
SE 4 mph
precip
68%
09.17
thu
DAY
74°F
SW 4 mph
precip
31%
NIGHT
70°F
SW 8 mph
precip
32%
09.18
fri
DAY
74°F
W 7 mph
precip
20%
NIGHT
68°F
NW 12 mph
precip
12%
09.19
sat
DAY
86°F
NE 11 mph
precip
3%
NIGHT
82°F
SE 7 mph
precip
6%
09.20
sun
DAY
74°F
SW 6 mph
precip
49%
NIGHT
68°F
SW 9 mph
precip
73%
09.21
mon
DAY
74°F
SE 4 mph
precip
23%
NIGHT
70°F
N 3 mph
precip
68%

Chicago Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Chicago was 22.4°F. The maximum and minimum values were 20.1°F and 23.7°F respectively.

Chicago on the Weather Map

Best Time to Visit Chicago
The most sunny months:
September 17 days
June 16 days
July 16 days
The most warm months:
July 83.5 °F
August 82.9 °F
June 76.6 °F
Warmest sea temperature:
August 72.7 °F
July 70.5 °F
September 67.9 °F
The most cold months:
January 25.6 °F
February 29.0 °F
December 34.1 °F
The most rainy months:
June 6 days
May 6 days
July 5 days
The most windy months:
November 12 mph
January 12 mph
February 11 mph
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