Current sea water temperature:
+34.3°F
| Minimum sea water temperature in January: | 37.9°F |
| Maximum sea water temperature in January: | 31.8°F |
| Average sea water temperature in January: | 33.8°F |
| more information | |
14 days
forecast
forecast
| Duluth |
monthly
weather
weather
| Duluth |
Sea water temperature for the last 10 days:
| January 13 | 34.3°F | January 8 | 34.7°F |
| January 12 | 34.0°F | January 7 | 34.9°F |
| January 11 | 34.2°F | January 6 | 35.1°F |
| January 10 | 34.3°F | January 5 | 35.4°F |
| January 9 | 34.5°F | January 4 | 35.8°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: 12:45
January 13, tuesday
1500
37°F
E
14 mph
14 mph
1800
34°F
E
13 mph
13 mph
2100
30°F
SE
19 mph
19 mph
January 14, wednesday
0000
18°F
SE
18 mph
18 mph
0300
10°F
S
17 mph
17 mph
0600
9°F
S
16 mph
16 mph
0900
7°F
S
15 mph
15 mph
1200
14°F
S
13 mph
13 mph
