Current Sea Water Temperature:
+51.8°F
| Maximum Sea Water Temperature in October: | 65.4°F |
| Minimum Sea Water Temperature in October: | 44.4°F |
| Average water temperature in October: | 53.1°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| October 05 | 51.8°F | September 30 | 54.6°F |
| October 04 | 54.8°F | September 29 | 54.4°F |
| October 03 | 54.4°F | September 28 | 53.6°F |
| October 02 | 55.8°F | September 27 | 53.0°F |
| October 01 | 57.2°F | September 26 | 52.8°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 54.3°F. The maximum and minimum values were 47.6°F and 61.4°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2026 for Grand Marais was 56.9°F. The maximum and minimum values were 45.2°F and 64.4°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 |  |
+58 |
| Chicago | |
+60 |
| Hawaii |  |
+82 |
| Houston |  |
+84 |
| Las Vegas |  |
+92 |
| Los Angeles | |
+102 |
| Maui |  |
+74 |
| Miami | |
+88 |
| Myrtle Beach | |
+70 |
| New York | |
+62 |
| San Diego | |
+84 |
| San Francisco | |
+66 |
| Santa Monica | |
+94 |
| Sarasota | |
+84 |
| Washington | |
+64 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Grand Marais
Local time: 20:03
05 oct, monday
| 2100 |  |
46°F | W 5 mph |
06 oct, tuesday
| 0000 |  |
46°F | W 6 mph |
| 0300 | |
46°F | W 7 mph |
| 0600 | |
46°F | W 7 mph |
| 0900 | |
52°F | N 6 mph |
| 1200 | |
56°F | NE 11 mph |
| 1500 | |
58°F | NE 9 mph |
| 1800 | |
58°F | E 4 mph |