Current sea water temperature:
+36.5°F
| Minimum sea water temperature in April: | 48.4°F |
| Maximum sea water temperature in April: | 32.2°F |
| Average sea water temperature in April: | 36.5°F |
| more information | |
14 days
forecast
forecast
| Duluth |
monthly
weather
weather
| Duluth |
Sea water temperature for the last 10 days:
| April 29 | 36.5°F | April 24 | 34.0°F |
| April 28 | 36.5°F | April 23 | 34.5°F |
| April 27 | 36.3°F | April 22 | 36.3°F |
| April 26 | 36.3°F | April 21 | 36.0°F |
| April 25 | 36.1°F | April 20 | 34.9°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
May
May
| Duluth |
Best time for vacation in Duluth
Duluth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Duluth
Local time: 07:15
April 29, wednesday
0900
41°F
SE
6 mph
6 mph
1200
43°F
SE
9 mph
9 mph
1500
45°F
SE
11 mph
11 mph
1800
46°F
SE
9 mph
9 mph
2100
37°F
S
6 mph
6 mph
April 30, thursday
0000
32°F
S
6 mph
6 mph
0300
30°F
SE
4 mph
4 mph
0600
32°F
SE
4 mph
4 mph
