Current sea water temperature:
+37.0°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 18 | 37.0°F | December 13 | 38.8°F |
| December 17 | 36.3°F | December 12 | 39.0°F |
| December 16 | 39.6°F | December 11 | 39.2°F |
| December 15 | 38.8°F | December 10 | 39.4°F |
| December 14 | 39.2°F | December 9 | 40.1°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: 13:59
December 18, thursday
1500
43°F
E
17 mph
17 mph
1800
41°F
E
11 mph
11 mph
2100
36°F
NE
15 mph
15 mph
December 19, friday
0000
27°F
E
16 mph
16 mph
0300
18°F
E
19 mph
19 mph
0600
14°F
E
20 mph
20 mph
0900
12°F
SE
19 mph
19 mph
1200
16°F
SE
17 mph
17 mph
