Current sea water temperature:
+37.0°F
| Minimum sea water temperature in May: | 40.1°F |
| Maximum sea water temperature in May: | 32.7°F |
| Average sea water temperature in May: | 36.3°F |
| more information | |
14 days
forecast
forecast
| Grand Marais |
monthly
weather
weather
| Grand Marais |
Sea water temperature for the last 10 days:
| May 19 | 37.0°F | May 14 | 35.6°F |
| May 18 | 35.2°F | May 13 | 34.7°F |
| May 17 | 36.1°F | May 12 | 34.7°F |
| May 16 | 36.7°F | May 11 | 34.7°F |
| May 15 | 34.5°F | May 10 | 34.7°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:
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
May
May
| 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: 07:35
May 19, tuesday
0900
41°F
E
10 mph
10 mph
1200
41°F
SE
13 mph
13 mph
1500
43°F
SE
14 mph
14 mph
1800
45°F
SE
12 mph
12 mph
2100
41°F
SE
9 mph
9 mph
May 20, wednesday
0000
36°F
SE
6 mph
6 mph
0300
34°F
SE
6 mph
6 mph
0600
34°F
SE
7 mph
7 mph
