28.09
mon
mon
Day
55°F
NW 6 mph
Precip.
19%
19%
Night
55°F
SW 7 mph
Precip.
26%
26%
29.09
tue
tue
Day
59°F
N 7 mph
Precip.
32%
32%
Night
54°F
NE 6 mph
Precip.
45%
45%
30.09
wed
wed
Day
57°F
NE 6 mph
Precip.
42%
42%
Night
59°F
SE 5 mph
Precip.
42%
42%
01.10
thu
thu
Day
55°F
E 19 mph
Precip.
1%
1%
Night
48°F
E 12 mph
Precip.
3%
3%
02.10
fri
fri
Day
52°F
SE 12 mph
Precip.
1%
1%
Night
48°F
SE 4 mph
Precip.
12%
12%
03.10
sat
sat
Day
50°F
N 9 mph
Precip.
17%
17%
Night
52°F
NE 11 mph
Precip.
60%
60%
04.10
sun
sun
Day
50°F
SE 12 mph
Precip.
23%
23%
Night
43°F
SE 15 mph
Precip.
19%
19%
sea water
temperature
temperature
| Grand Marais |
monthly
weather
weather
| Grand Marais |
current
weather
weather
| Grand Marais |
14 days
forecast
forecast
| Grand Marais |
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.
Air temperature in Grand Marais, °F
Precipitation total in Grand Marais, in.
* Charts above show average data for the last 3 years.
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
