Current Sea Water Temperature:
+55.6°F
| Maximum Sea Water Temperature in September: | 68.2°F |
| Minimum Sea Water Temperature in September: | 47.8°F |
| Average water temperature in September: | 60.3°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| September 15 | 55.6°F | September 10 | 63.4°F |
| September 14 | 60.0°F | September 09 | 62.6°F |
| September 13 | 59.4°F | September 08 | 63.2°F |
| September 12 | 63.0°F | September 07 | 64.0°F |
| September 11 | 61.6°F | September 06 | 62.8°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 September, August and October.
Average Water Temperature by Month, °F
Sea Water Temperature in September
The average sea surface temperature in September 2026 for Grand Marais was 61.9°F. The maximum and minimum values were 55.6°F and 64.4°F respectively.
Sea Water Temperature in August
The average sea surface temperature in August 2026 for Grand Marais was 54.3°F. The maximum and minimum values were 47.6°F and 61.4°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 |  |
+62 |
| Chicago |  |
+66 |
| Hawaii |  |
+80 |
| Las Vegas | |
+80 |
| Los Angeles | |
+72 |
| Maui |  |
+66 |
| Miami |  |
+88 |
| Myrtle Beach | |
+78 |
| New York | |
+66 |
| Panama City Beach | |
+90 |
| San Diego | |
+70 |
| San Francisco |  |
+60 |
| Santa Monica | |
+70 |
| Sarasota | |
+86 |
| Washington | |
+66 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Grand Marais
Local time: 09:33
15 sep, tuesday
| 1200 |  |
54°F | E 19 mph |
| 1500 |  |
62°F | E 16 mph |
| 1800 | |
62°F | E 12 mph |
| 2100 |  |
56°F | E 7 mph |
16 sep, wednesday
| 0000 | |
54°F | SE 9 mph |
| 0300 |  |
48°F | SE 9 mph |
| 0600 | |
46°F | SE 3 mph |
| 0900 |  |
48°F | S 3 mph |