Current sea water temperature:
+32.2°F
| Minimum sea water temperature in March: | 36.7°F |
| Maximum sea water temperature in March: | 32.0°F |
| Average sea water temperature in March: | 33.9°F |
| more information | |
14 days
forecast
forecast
| Grand Marais |
monthly
weather
weather
| Grand Marais |
Sea water temperature for the last 10 days:
| March 18 | 32.2°F | March 13 | 32.4°F |
| March 17 | 32.4°F | March 12 | 32.5°F |
| March 16 | 32.7°F | March 11 | 32.9°F |
| March 15 | 32.7°F | March 10 | 32.9°F |
| March 14 | 32.4°F | March 9 | 33.3°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
March
March
| 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: 19:19
March 18, wednesday
2100
32°F
E
6 mph
6 mph
March 19, thursday
0000
28°F
SE
4 mph
4 mph
0300
25°F
SE
5 mph
5 mph
0600
27°F
S
6 mph
6 mph
0900
28°F
SW
3 mph
3 mph
1200
30°F
NW
5 mph
5 mph
1500
32°F
N
4 mph
4 mph
1800
30°F
NW
4 mph
4 mph
