S
M
T
W
T
F
S
26
69°
57°
27
69°
57°
28
65°
58°
29
68°
57°
30
70°
58°
31
70°
54°
1
70°
57°
2
70°
59°
3
71°
56°
4
71°
53°
5
67°
58°
6
68°
59°
7
70°
58°
8
71°
55°
9
68°
53°
10
70°
58°
11
71°
53°
12
71°
53°
13
67°
59°
14
71°
60°
15
70°
55°
16
70°
52°
17
66°
52°
18
65°
53°
19
66°
53°
20
68°
56°
21
64°
52°
22
63°
58°
23
70°
59°
24
69°
57°
25
70°
51°
26
64°
49°
27
62°
50°
28
63°
51°
29
62°
52°
30
63°
57°
31
65°
58°
1
69°
58°
2
69°
57°
3
68°
55°
4
69°
57°
5
68°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grand Manan
Grand Manan's August 2026 forecast shows daily high temperatures ranging from 62° to 71°, with overnight lows between 49° and 60°. The average high for August is 68° 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 Manan. See also: September | October | November.
