Current sea water temperature:
+69.4°F
| Minimum sea water temperature in August: | 71.4°F |
| Maximum sea water temperature in August: | 53.2°F |
| Average sea water temperature in August: | 65.7°F |
| more information | |
14 days
forecast
forecast
| Duluth |
monthly
weather
weather
| Duluth |
Sea water temperature for the last 10 days:
| August 14 | 69.4°F | August 9 | 63.1°F |
| August 13 | 68.5°F | August 8 | 63.1°F |
| August 12 | 66.2°F | August 7 | 62.1°F |
| August 11 | 63.3°F | August 6 | 64.2°F |
| August 10 | 63.7°F | August 5 | 64.2°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 64.4°F. The highest and lowest sea temperatures during the month were 73.2°F and 54.5°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
August
August
| Duluth |
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 06:11
August 14, friday
0900
66°F
W
8 mph
8 mph
1200
72°F
W
11 mph
11 mph
1500
73°F
W
14 mph
14 mph
1800
70°F
SW
17 mph
17 mph
2100
64°F
SW
14 mph
14 mph
August 15, saturday
0000
64°F
W
11 mph
11 mph
0300
61°F
SW
7 mph
7 mph
0600
61°F
W
8 mph
8 mph
