S
M
T
W
T
F
S
26
74°
58°
27
68°
58°
28
73°
59°
29
74°
58°
30
68°
58°
31
67°
57°
1
68°
59°
2
71°
60°
3
76°
60°
4
74°
59°
5
68°
59°
6
73°
60°
7
75°
58°
8
74°
51°
9
69°
51°
10
67°
52°
11
69°
51°
12
67°
52°
13
67°
53°
14
71°
57°
15
72°
51°
16
67°
50°
17
69°
54°
18
72°
58°
19
74°
57°
20
71°
59°
21
73°
59°
22
74°
55°
23
73°
57°
24
73°
51°
25
69°
51°
26
64°
55°
27
65°
53°
28
64°
53°
29
65°
51°
30
64°
50°
31
63°
54°
1
64°
51°
2
65°
54°
3
70°
56°
4
71°
55°
5
70°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grand Marais
Grand Marais's August 2026 forecast shows daily high temperatures ranging from 63° to 76°, with overnight lows between 50° and 60°. The average high for August is 70° with an average low of 55°. 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.
