Current Sea Water Temperature:
+32.2°F
| Maximum Sea Water Temperature in April: | 36.4°F |
| Minimum Sea Water Temperature in April: | 30.2°F |
| Average water temperature in April: | 32.6°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| April 23 | 32.2°F | April 18 | 30.8°F |
| April 22 | 31.4°F | April 17 | 30.6°F |
| April 21 | 31.2°F | April 16 | 30.4°F |
| April 20 | 31.4°F | April 15 | 30.2°F |
| April 19 | 31.6°F | April 14 | 32.0°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 2025 for Grand Marais was 62.5°F. The maximum and minimum values were 56.6°F and 67.4°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°
| Chicago |  |
+70 |
| Hawaii |  |
+76 |
| Honolulu | |
+76 |
| Houston | |
+82 |
| Las Vegas | |
+68 |
| Los Angeles |  |
+64 |
| Maui | |
+70 |
| Miami | |
+82 |
| Miami Beach | |
+82 |
| New York | |
+76 |
| San Diego | |
+66 |
| San Francisco | |
+58 |
| Sarasota | |
+88 |
| Tampa | |
+86 |
| Washington | |
+82 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Grand Marais
Local time: 11:12
23 apr, thursday
| 1200 |  |
48°F | W 13 mph |
| 1500 |  |
56°F | W 12 mph |
| 1800 | |
58°F | W 11 mph |
| 2100 |  |
52°F | W 9 mph |
24 apr, friday
| 0000 |  |
48°F | W 14 mph |
| 0300 | |
48°F | SW 14 mph |
| 0600 | |
46°F | SW 6 mph |
| 0900 | |
44°F | SE 22 mph |