Current sea water temperature:
+53.2°F
| Minimum sea water temperature in September: | 66.4°F |
| Maximum sea water temperature in September: | 45.7°F |
| Average sea water temperature in September: | 58.8°F |
| more information | |
14 days
forecast
forecast
| Grand Marais |
monthly
weather
weather
| Grand Marais |
Sea water temperature for the last 10 days:
| September 28 | 53.2°F | September 23 | 52.0°F |
| September 27 | 52.7°F | September 22 | 48.4°F |
| September 26 | 52.5°F | September 21 | 47.3°F |
| September 25 | 52.5°F | September 20 | 47.1°F |
| September 24 | 53.6°F | September 19 | 45.7°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:
2026
2025
2024
The average sea water temperature in August of 2026 was 53.9°F. The highest and lowest sea temperatures during the month were 60.3°F and 47.8°F.
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 56.4°F. The highest and lowest sea temperatures during the month were 63.0°F and 45.7°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
October
October
| 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: 12:18
September 28, monday
1500
57°F
NW
5 mph
5 mph
1800
57°F
SW
5 mph
5 mph
2100
55°F
SW
6 mph
6 mph
September 29, tuesday
0000
55°F
SW
7 mph
7 mph
0300
55°F
SW
4 mph
4 mph
0600
55°F
W
4 mph
4 mph
0900
57°F
NW
2 mph
2 mph
1200
59°F
N
7 mph
7 mph
