S
M
T
W
T
F
S
30
67°
50°
31
67°
51°
1
68°
52°
2
68°
56°
3
69°
57°
4
69°
58°
5
68°
59°
6
76°
53°
7
75°
51°
8
68°
50°
9
67°
50°
10
67°
52°
11
68°
55°
12
69°
54°
13
65°
52°
14
72°
51°
15
72°
55°
16
71°
57°
17
70°
56°
18
71°
54°
19
71°
52°
20
70°
52°
21
70°
50°
22
71°
45°
23
64°
47°
24
62°
49°
25
61°
48°
26
61°
43°
27
62°
43°
28
60°
46°
29
60°
43°
30
61°
44°
1
59°
42°
2
60°
41°
3
59°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bass Harbor
Bass Harbor's September 2026 forecast shows daily high temperatures ranging from 59° to 76°, with overnight lows between 41° and 59°. The average high for September is 67° with an average low of 50°. 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 Bass Harbor. See also: October | November | December.
