Current sea water temperature:
+34.7°F
| Minimum sea water temperature in December: | 42.8°F |
| Maximum sea water temperature in December: | 32.0°F |
| Average sea water temperature in December: | 37.1°F |
| more information | |
14 days
forecast
forecast
| Duluth |
monthly
weather
weather
| Duluth |
Sea water temperature for the last 10 days:
| December 27 | 34.7°F | December 22 | 37.0°F |
| December 26 | 35.1°F | December 21 | 38.1°F |
| December 25 | 35.4°F | December 20 | 36.9°F |
| December 24 | 36.0°F | December 19 | 37.2°F |
| December 23 | 36.5°F | December 18 | 37.2°F |
Monthly sea water temperature, °F
When is the warmest sea in Duluth?
Based on the data about daily sea water temperature for the last three years the warmest sea in Duluth was noticed in August, July and September.
Monthly Sea Temperatures in Duluth, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 67.5°F. The highest and lowest sea temperatures during the month were 71.1°F and 62.6°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 63.4°F. The highest and lowest sea temperatures during the month were 71.2°F and 58.1°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 60.7°F. The highest and lowest sea temperatures during the month were 65.1°F and 58.3°F.
current
weather
weather
| Duluth |
weather in
January
January
| Duluth |
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 19:33
December 27, saturday
2100
36°F
NE
2 mph
2 mph
December 28, sunday
0000
36°F
S
1 mph
1 mph
0300
36°F
S
4 mph
4 mph
0600
36°F
S
5 mph
5 mph
0900
32°F
SE
6 mph
6 mph
1200
30°F
SE
13 mph
13 mph
1500
23°F
S
19 mph
19 mph
1800
19°F
S
17 mph
17 mph
