Measurements:
°C
°F
CURRENT WEATHER
20:36
Grand Marais
46°F
W 4 mph
Feels like: 44°F
Precip: 9%
World Resorts USA Grand Marais Weather

7 Day Weather Forecast

10.05
mon
DAY
52°F
NE 6 mph
precip
3%
NIGHT
46°F
NW 6 mph
precip
23%
10.06
tue
DAY
56°F
NE 11 mph
precip
25%
NIGHT
56°F
SE 10 mph
precip
6%
10.07
wed
DAY
60°F
E 12 mph
precip
2%
NIGHT
50°F
SE 9 mph
precip
8%
10.08
thu
DAY
56°F
SE 11 mph
precip
13%
NIGHT
46°F
S 6 mph
precip
18%
10.09
fri
DAY
50°F
N 6 mph
precip
15%
NIGHT
48°F
W 11 mph
precip
27%
10.10
sat
DAY
52°F
NW 9 mph
precip
20%
NIGHT
56°F
NE 11 mph
precip
25%
10.11
sun
DAY
58°F
S 11 mph
precip
13%
NIGHT
42°F
SW 13 mph
precip
19%

Grand Marais Sea Water Temperature in October, °F

Select Year: 2025 2024 2023

The average sea surface temperature in October 2025 for Grand Marais was 12.1°F. The maximum and minimum values were 9.8°F and 15.7°F respectively.

Grand Marais on the Weather Map

Best Time to Visit Grand Marais
The most sunny months:
August 14 days
September 13 days
July 12 days
The most warm months:
August 69.8 °F
July 68.5 °F
September 63.3 °F
Warmest sea temperature:
August 60.3 °F
September 59.7 °F
October 53.1 °F
The most cold months:
January 15.2 °F
February 16.3 °F
December 22.1 °F
The most rainy months:
August 3 days
April 2 days
July 2 days
The most windy months:
November 10 mph
December 9 mph
January 9 mph
more details