Current sea water temperature:
+39.2°F
| Minimum sea water temperature in December: | 47.7°F |
| Maximum sea water temperature in December: | 32.2°F |
| Average sea water temperature in December: | 40.7°F |
| more information | |
14 days
forecast
forecast
| Chicago |
monthly
weather
weather
| Chicago |
Sea water temperature for the last 10 days:
| December 14 | 39.2°F | December 9 | 40.1°F |
| December 13 | 38.8°F | December 8 | 40.8°F |
| December 12 | 39.0°F | December 7 | 41.0°F |
| December 11 | 39.2°F | December 6 | 41.5°F |
| December 10 | 39.4°F | December 5 | 41.4°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:
2025
2024
2023
The average sea water temperature in August of 2025 was 73.8°F. The highest and lowest sea temperatures during the month were 77.9°F and 69.1°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 73.3°F. The highest and lowest sea temperatures during the month were 76.3°F and 70.9°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
December
December
| Chicago |
Best time for vacation in Chicago
Chicago on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Chicago
Local time: 20:24
December 14, sunday
2100
10°F
E
7 mph
7 mph
December 15, monday
0000
9°F
NE
9 mph
9 mph
0300
9°F
NE
12 mph
12 mph
0600
10°F
NE
15 mph
15 mph
0900
14°F
NE
17 mph
17 mph
1200
21°F
NE
17 mph
17 mph
1500
25°F
E
13 mph
13 mph
1800
25°F
E
9 mph
9 mph
