Measurements:
°C
°F
CURRENT WEATHER
14:16
Grand Marais
62°F
NE 9 mph
Feels like: 62°F
Precip: 5%
World Resorts USA Grand Marais Weather

7 Day Weather Forecast

08.05
wed
DAY
60°F
NE 9 mph
precip
7%
NIGHT
58°F
SW 2 mph
precip
3%
08.06
thu
DAY
66°F
NE 9 mph
precip
4%
NIGHT
62°F
E 7 mph
precip
11%
08.07
fri
DAY
68°F
NW 5 mph
precip
12%
NIGHT
58°F
SE 7 mph
precip
5%
08.08
sat
DAY
64°F
W 3 mph
precip
7%
NIGHT
54°F
S 2 mph
precip
15%
08.09
sun
DAY
70°F
SE 9 mph
precip
1%
NIGHT
58°F
SE 9 mph
precip
5%
08.10
mon
DAY
70°F
E 7 mph
precip
3%
NIGHT
58°F
SE 4 mph
precip
8%
08.11
tue
DAY
66°F
E 8 mph
precip
11%
NIGHT
56°F
SE 6 mph
precip
9%

Grand Marais Sea Water Temperature in August, °F

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Grand Marais was 16.3°F. The maximum and minimum values were 13.3°F and 18.7°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 61.3 °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