Measurements:
°C
°F
CURRENT WEATHER
08:41
Grand Marais
54°F
E 19 mph
Feels like: 48°F
Precip: 9%
World Resorts USA Grand Marais Weather

7 Day Weather Forecast

09.15
tue
DAY
56°F
E 19 mph
precip
6%
NIGHT
52°F
SE 9 mph
precip
11%
09.16
wed
DAY
50°F
NW 7 mph
precip
7%
NIGHT
52°F
SW 4 mph
precip
9%
09.17
thu
DAY
60°F
N 4 mph
precip
4%
NIGHT
54°F
S 4 mph
precip
9%
09.18
fri
DAY
54°F
W 7 mph
precip
38%
NIGHT
50°F
SW 12 mph
precip
29%
09.19
sat
DAY
58°F
W 13 mph
precip
21%
NIGHT
58°F
S 7 mph
precip
31%
09.20
sun
DAY
54°F
W 15 mph
precip
23%
NIGHT
48°F
SW 9 mph
precip
29%
09.21
mon
DAY
52°F
W 14 mph
precip
24%
NIGHT
48°F
SW 10 mph
precip
68%

Grand Marais Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Grand Marais was 16.0°F. The maximum and minimum values were 12.8°F and 17.2°F respectively.

Grand Marais on the Weather Map

Best Time to Visit Grand Marais
The most sunny months:
September 14 days
August 14 days
July 12 days
The most warm months:
August 69.8 °F
July 68.5 °F
September 63.5 °F
Warmest sea temperature:
August 60.3 °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
July 2 days
The most windy months:
November 10 mph
December 9 mph
January 9 mph
more details