S
M
T
W
T
F
S
26
84°
62°
27
86°
61°
28
73°
54°
29
84°
52°
30
88°
57°
31
83°
64°
1
76°
63°
2
76°
57°
3
81°
50°
4
79°
58°
5
72°
55°
6
81°
60°
7
81°
59°
8
74°
60°
9
76°
56°
10
74°
58°
11
73°
56°
12
74°
57°
13
74°
56°
14
73°
59°
15
75°
58°
16
73°
59°
17
74°
56°
18
75°
60°
19
73°
60°
20
72°
60°
21
73°
61°
22
78°
61°
23
76°
60°
24
74°
60°
25
75°
61°
26
77°
61°
27
74°
60°
28
70°
59°
29
72°
60°
30
77°
61°
31
77°
59°
1
71°
58°
2
69°
59°
3
73°
60°
4
76°
60°
5
76°
59°
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 69° to 81°, with overnight lows between 55° and 61°. The average high for August is 75° with an average low of 59°. 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.
