Current sea water temperature:
+39.6°F
| Minimum sea water temperature in December: | 43.9°F |
| Maximum sea water temperature in December: | 37.6°F |
| Average sea water temperature in December: | 39.7°F |
| more information | |
14 days
forecast
forecast
| Grand Marais |
monthly
weather
weather
| Grand Marais |
Sea water temperature for the last 10 days:
| December 4 | 39.6°F | November 29 | 40.1°F |
| December 3 | 40.3°F | November 28 | 40.5°F |
| December 2 | 40.1°F | November 27 | 40.6°F |
| December 1 | 40.3°F | November 26 | 40.6°F |
| November 30 | 40.5°F | November 25 | 41.4°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
December
December
| 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: 22:12
December 05, friday
0000
16°F
E
16 mph
16 mph
0300
18°F
E
9 mph
9 mph
0600
19°F
E
6 mph
6 mph
0900
14°F
SE
5 mph
5 mph
1200
21°F
NE
7 mph
7 mph
1500
23°F
NE
9 mph
9 mph
1800
21°F
E
10 mph
10 mph
2100
18°F
SE
14 mph
14 mph
