Measurements:
°C
°F
CURRENT WEATHER
16:52
Grand Marais
66°F
N 3 mph
Feels like: 66°F
Precip: 85%
World Resorts USA Grand Marais Weather

7 Day Weather Forecast

08.25
tue
DAY
60°F
N 3 mph
precip
89%
NIGHT
62°F
SW 4 mph
precip
64%
08.26
wed
DAY
64°F
SE 8 mph
precip
27%
NIGHT
68°F
SE 10 mph
precip
6%
08.27
thu
DAY
68°F
SE 7 mph
precip
2%
NIGHT
56°F
S 7 mph
precip
6%
08.28
fri
DAY
56°F
NW 7 mph
precip
4%
NIGHT
54°F
SW 6 mph
precip
13%
08.29
sat
DAY
58°F
W 9 mph
precip
33%
NIGHT
64°F
SW 9 mph
precip
32%
08.30
sun
DAY
66°F
N 7 mph
precip
23%
NIGHT
60°F
SW 15 mph
precip
16%
08.31
mon
DAY
60°F
W 6 mph
precip
49%
NIGHT
60°F
N 6 mph
precip
76%

Grand Marais Sea Water Temperature in August, °F

Select Year: 2026 2025 2024

The average sea surface temperature in August 2026 for Grand Marais was 11.7°F. The maximum and minimum values were 8.8°F and 13.7°F respectively.

Grand Marais on the Weather Map

Best Time to Visit Grand Marais
The most sunny months:
September 14 days
August 13 days
July 12 days
The most warm months:
August 70.1 °F
July 68.5 °F
September 63.5 °F
Warmest sea temperature:
August 60.2 °F
September 60.2 °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
June 2 days
The most windy months:
November 10 mph
December 9 mph
January 9 mph
more details