S
M
T
W
T
F
S
26
64°
48°
27
67°
47°
28
61°
49°
29
70°
50°
30
75°
55°
31
75°
53°
1
73°
58°
2
66°
54°
3
68°
52°
4
74°
48°
5
65°
51°
6
68°
50°
7
77°
53°
8
65°
45°
9
64°
51°
10
65°
47°
11
68°
54°
12
67°
53°
13
69°
53°
14
67°
52°
15
64°
58°
16
80°
55°
17
66°
58°
18
75°
56°
19
66°
51°
20
59°
51°
21
75°
55°
22
76°
55°
23
71°
48°
24
65°
49°
25
66°
51°
26
78°
57°
27
67°
54°
28
67°
51°
29
66°
50°
30
N/A
31
69°
58°
1
74°
57°
2
69°
55°
3
66°
60°
4
70°
59°
5
73°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Grand Marais
Grand Marais's August 2026 forecast shows daily high temperatures ranging from 66° to 74°, with overnight lows between 55° and 60°. The average high for August is 70° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Grand Marais. See also: September | October | November.
