S
M
T
W
T
F
S
30
63°
57°
31
65°
58°
1
69°
58°
2
69°
57°
3
68°
55°
4
69°
57°
5
68°
50°
6
68°
49°
7
61°
50°
8
62°
56°
9
63°
55°
10
66°
50°
11
64°
55°
12
63°
52°
13
67°
49°
14
63°
54°
15
66°
52°
16
62°
50°
17
66°
47°
18
59°
51°
19
Hist. Avg.
63°
46°
20
Hist. Avg.
63°
46°
21
Hist. Avg.
63°
45°
22
Hist. Avg.
62°
45°
23
Hist. Avg.
62°
45°
24
Hist. Avg.
62°
44°
25
Hist. Avg.
62°
44°
26
Hist. Avg.
61°
44°
27
Hist. Avg.
61°
44°
28
Hist. Avg.
61°
43°
29
Hist. Avg.
60°
43°
30
Hist. Avg.
60°
43°
1
Hist. Avg.
60°
43°
2
Hist. Avg.
59°
42°
3
Hist. Avg.
59°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Grand Manan
Grand Manan's September 2026 forecast shows daily high temperatures ranging from 59° to 69°, with overnight lows between 47° and 58°. The average high for September is 65° with an average low of 53°. 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.
