Current sea water temperature:
+66.7°F
| Minimum sea water temperature in July: | 73.2°F |
| Maximum sea water temperature in July: | 48.6°F |
| Average sea water temperature in July: | 63.9°F |
| more information | |
14 days
forecast
forecast
| Duluth |
monthly
weather
weather
| Duluth |
Sea water temperature for the last 10 days:
| July 21 | 66.7°F | July 16 | 70.5°F |
| July 20 | 67.5°F | July 15 | 68.5°F |
| July 19 | 68.0°F | July 14 | 68.9°F |
| July 18 | 72.9°F | July 13 | 69.6°F |
| July 17 | 73.2°F | July 12 | 68.0°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 65.0°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
July
July
| Duluth |
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 10:48
July 21, tuesday
1200
64°F
SE
16 mph
16 mph
1500
66°F
S
14 mph
14 mph
1800
70°F
S
12 mph
12 mph
2100
59°F
SW
12 mph
12 mph
July 22, wednesday
0000
50°F
S
5 mph
5 mph
0300
48°F
SE
5 mph
5 mph
0600
46°F
SE
5 mph
5 mph
0900
63°F
SE
5 mph
5 mph
