S
M
T
W
T
F
S
30
68°
55°
31
67°
54°
1
68°
55°
2
66°
55°
3
59°
55°
4
71°
57°
5
68°
53°
6
58°
53°
7
70°
53°
8
67°
51°
9
62°
46°
10
68°
55°
11
64°
53°
12
66°
50°
13
62°
54°
14
67°
53°
15
64°
48°
16
65°
48°
17
62°
53°
18
68°
52°
19
64°
48°
20
60°
48°
21
65°
47°
22
62°
46°
23
63°
46°
24
68°
47°
25
62°
54°
26
61°
55°
27
59°
57°
28
59°
55°
29
60°
55°
30
62°
54°
1
61°
55°
2
62°
54°
3
60°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grand Manan
Grand Manan's September 2026 forecast shows daily high temperatures ranging from 59° to 68°, with overnight lows between 47° and 57°. The average high for September is 61° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Grand Manan. See also: October | November | December.
