Current sea water temperature:
+55.2°F
| Minimum sea water temperature in August: | 66.0°F |
| Maximum sea water temperature in August: | 44.1°F |
| Average sea water temperature in August: | 59.5°F |
| more information | |
14 days
forecast
forecast
| Grand Marais |
monthly
weather
weather
| Grand Marais |
Sea water temperature for the last 10 days:
| August 14 | 55.2°F | August 9 | 50.9°F |
| August 13 | 53.4°F | August 8 | 51.1°F |
| August 12 | 51.6°F | August 7 | 50.4°F |
| August 11 | 51.1°F | August 6 | 51.8°F |
| August 10 | 51.6°F | August 5 | 52.0°F |
Monthly sea water temperature, °F
When is the warmest sea in Grand Marais?
Based on the data about daily sea water temperature for the last three years the warmest sea in Grand Marais was noticed in August, September and October.
Monthly Sea Temperatures in Grand Marais, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 61.3°F. The highest and lowest sea temperatures during the month were 65.7°F and 55.9°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 58.5°F. The highest and lowest sea temperatures during the month were 62.8°F and 55.0°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 53.8°F. The highest and lowest sea temperatures during the month were 60.3°F and 49.6°F.
current
weather
weather
| Grand Marais |
weather in
August
August
| Grand Marais |
Best time for vacation in Grand Marais
Grand Marais on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Grand Marais
Local time: 04:10
August 14, friday
0600
55°F
SW
6 mph
6 mph
0900
64°F
W
9 mph
9 mph
1200
66°F
W
9 mph
9 mph
1500
66°F
W
9 mph
9 mph
1800
64°F
W
9 mph
9 mph
2100
57°F
SW
7 mph
7 mph
August 15, saturday
0000
57°F
SW
9 mph
9 mph
0300
59°F
SW
9 mph
9 mph
