Current sea water temperature:
+61.2°F
| Minimum sea water temperature in September: | 69.4°F |
| Maximum sea water temperature in September: | 52.2°F |
| Average sea water temperature in September: | 62.6°F |
| more information | |
14 days
forecast
forecast
| Duluth |
monthly
weather
weather
| Duluth |
Sea water temperature for the last 10 days:
| September 19 | 61.2°F | September 14 | 63.0°F |
| September 18 | 61.0°F | September 13 | 63.3°F |
| September 17 | 60.4°F | September 12 | 63.7°F |
| September 16 | 61.9°F | September 11 | 63.1°F |
| September 15 | 62.4°F | September 10 | 65.3°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:
2026
2025
2024
The average sea water temperature in August of 2026 was 64.9°F. The highest and lowest sea temperatures during the month were 69.4°F and 60.4°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:
2026
2025
2024
The average sea water temperature in September of 2026 was 64.2°F. The highest and lowest sea temperatures during the month were 67.8°F and 60.4°F.
current
weather
weather
| Duluth |
weather in
September
September
| Duluth |
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 04:17
September 19, saturday
0600
54°F
SW
11 mph
11 mph
0900
55°F
SW
11 mph
11 mph
1200
57°F
SW
14 mph
14 mph
1500
57°F
SW
15 mph
15 mph
1800
57°F
SW
13 mph
13 mph
2100
55°F
SW
8 mph
8 mph
September 20, sunday
0000
54°F
SW
8 mph
8 mph
0300
54°F
SW
8 mph
8 mph
