Current Sea Water Temperature:
+60.2°F
| Maximum Sea Water Temperature in June: | 66.4°F |
| Minimum Sea Water Temperature in June: | 38.0°F |
| Average water temperature in June: | 53.2°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| June 24 | 60.2°F | June 19 | 49.6°F |
| June 23 | 57.4°F | June 18 | 51.0°F |
| June 22 | 54.2°F | June 17 | 49.2°F |
| June 21 | 51.2°F | June 16 | 46.6°F |
| June 20 | 48.8°F | June 15 | 46.6°F |
When is the Warmest Sea for Duluth?
According to our data for the last three years for Duluth the highest average sea water temperature was in August, July and September.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Duluth was 69.4°F. The maximum and minimum values were 64.0°F and 73.4°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Duluth was 64.9°F. The maximum and minimum values were 59.0°F and 73.6°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Duluth was 61.9°F. The maximum and minimum values were 59.2°F and 66.8°F respectively.
USA Resorts:
NAME
F°
| Chicago |  |
+66 |
| Hawaii |  |
+80 |
| Honolulu | |
+80 |
| Houston |  |
+82 |
| Las Vegas | |
+96 |
| Los Angeles |  |
+66 |
| Maui |  |
+74 |
| Miami | |
+80 |
| Miami Beach | |
+88 |
| Myrtle Beach | |
+78 |
| New York | |
+70 |
| San Diego | |
+68 |
| San Francisco | |
+58 |
| Sarasota | |
+84 |
| Tampa | |
+84 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Duluth
Local time: 23:15
25 jun, thursday
| 0000 |  |
58°F | SW 7 mph |
| 0300 |  |
58°F | SW 6 mph |
| 0600 |  |
58°F | SW 5 mph |
| 0900 | |
60°F | SW 7 mph |
| 1200 | |
62°F | W 7 mph |
| 1500 |  |
66°F | W 7 mph |
| 1800 | |
64°F | W 5 mph |
| 2100 | |
54°F | SW 5 mph |