Current sea water temperature:
+69.3°F
| Minimum sea water temperature in September: | 75.9°F |
| Maximum sea water temperature in September: | 32.0°F |
| Average sea water temperature in September: | 66.3°F |
| more information | |
14 days
forecast
forecast
| Chicago |
monthly
weather
weather
| Chicago |
Sea water temperature for the last 10 days:
| September 14 | 69.3°F | September 9 | 72.7°F |
| September 13 | 70.2°F | September 8 | 72.9°F |
| September 12 | 70.5°F | September 7 | 73.2°F |
| September 11 | 72.0°F | September 6 | 73.9°F |
| September 10 | 72.1°F | September 5 | 74.7°F |
Monthly sea water temperature, °F
When is the warmest sea in Chicago?
Based on the data about daily sea water temperature for the last three years the warmest sea in Chicago was noticed in August, July and September.
Monthly Sea Temperatures in Chicago, °F
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 72.7°F. The highest and lowest sea temperatures during the month were 74.3°F and 68.5°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 72.8°F. The highest and lowest sea temperatures during the month were 78.8°F and 66.0°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 65.0°F. The highest and lowest sea temperatures during the month were 70.2°F and 59.0°F.
current
weather
weather
| Chicago |
weather in
September
September
| Chicago |
Best time for vacation in Chicago
Chicago on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Chicago
Local time: 15:40
September 14, monday
1800
72°F
NW
14 mph
14 mph
2100
66°F
NW
16 mph
16 mph
September 15, tuesday
0000
66°F
N
14 mph
14 mph
0300
66°F
N
17 mph
17 mph
0600
68°F
N
14 mph
14 mph
0900
66°F
N
11 mph
11 mph
1200
72°F
NE
9 mph
9 mph
1500
77°F
E
7 mph
7 mph
