Current sea water temperature:
+32.5°F
| Minimum sea water temperature in March: | 37.6°F |
| Maximum sea water temperature in March: | 31.6°F |
| Average sea water temperature in March: | 33.6°F |
| more information | |
14 days
forecast
forecast
| Duluth |
monthly
weather
weather
| Duluth |
Sea water temperature for the last 10 days:
| March 18 | 32.5°F | March 13 | 32.2°F |
| March 17 | 32.4°F | March 12 | 32.0°F |
| March 16 | 32.5°F | March 11 | 31.8°F |
| March 15 | 32.5°F | March 10 | 31.6°F |
| March 14 | 32.4°F | March 9 | 32.5°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
March
March
| Duluth |
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 21:50
March 19, thursday
0000
34°F
E
3 mph
3 mph
0300
34°F
SE
3 mph
3 mph
0600
25°F
SW
4 mph
4 mph
0900
27°F
NW
2 mph
2 mph
1200
32°F
W
3 mph
3 mph
1500
34°F
NW
2 mph
2 mph
1800
34°F
NW
2 mph
2 mph
2100
34°F
N
2 mph
2 mph
