Current Sea Water Temperature:
+55.0°F
| Maximum Sea Water Temperature in August: | 67.8°F |
| Minimum Sea Water Temperature in August: | 43.4°F |
| Average water temperature in August: | 60.2°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| August 25 | 55.0°F | August 20 | 52.4°F |
| August 24 | 52.6°F | August 19 | 55.6°F |
| August 23 | 57.4°F | August 18 | 56.6°F |
| August 22 | 56.4°F | August 17 | 57.0°F |
| August 21 | 53.6°F | August 16 | 55.8°F |
When is the Warmest Sea for Grand Marais?
According to our data for the last three years for Grand Marais the highest average sea water temperature was in August, September and October.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2026 for Grand Marais was 53.3°F. The maximum and minimum values were 47.6°F and 57.4°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Grand Marais was 59.5°F. The maximum and minimum values were 55.6°F and 64.2°F respectively.
Sea Water Temperature in October
The average sea surface temperature in October 2025 for Grand Marais was 54.2°F. The maximum and minimum values were 49.6°F and 61.4°F respectively.
USA Resorts:
NAME
F°
| Boston |  |
+80 |
| Chicago |  |
+82 |
| Hawaii |  |
+84 |
| Houston | |
+108 |
| Las Vegas |  |
+116 |
| Los Angeles | |
+96 |
| Maui | |
+70 |
| Miami | |
+92 |
| Myrtle Beach | |
+84 |
| New York | |
+82 |
| San Diego | |
+96 |
| San Francisco | |
+64 |
| Santa Monica | |
+86 |
| Sarasota | |
+92 |
| Washington | |
+84 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Grand Marais
Local time: 16:27
25 aug, tuesday
| 1800 |  |
66°F | N 3 mph |
| 2100 | |
64°F | SW 8 mph |
26 aug, wednesday
| 0000 |  |
62°F | SW 4 mph |
| 0300 |  |
62°F | SE 6 mph |
| 0600 | |
60°F | E 6 mph |
| 0900 | |
62°F | SE 6 mph |
| 1200 | |
64°F | SE 8 mph |
| 1500 |  |
70°F | S 11 mph |