Current sea water temperature:
+44.8°F
| Minimum sea water temperature in July: | 67.6°F |
| Maximum sea water temperature in July: | 36.3°F |
| Average sea water temperature in July: | 51.0°F |
| more information | |
14 days
forecast
forecast
| Grand Marais |
monthly
weather
weather
| Grand Marais |
Sea water temperature for the last 10 days:
| July 21 | 44.8°F | July 16 | 41.2°F |
| July 20 | 41.9°F | July 15 | 39.7°F |
| July 19 | 40.8°F | July 14 | 46.0°F |
| July 18 | 39.7°F | July 13 | 46.0°F |
| July 17 | 41.9°F | July 12 | 42.6°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
July
July
| 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: 08:36
July 21, tuesday
0900
63°F
SE
15 mph
15 mph
1200
61°F
SE
14 mph
14 mph
1500
61°F
S
15 mph
15 mph
1800
57°F
S
11 mph
11 mph
2100
55°F
S
9 mph
9 mph
July 22, wednesday
0000
55°F
SE
11 mph
11 mph
0300
52°F
SE
11 mph
11 mph
0600
50°F
SE
9 mph
9 mph
