S
M
T
W
T
F
S
30
74°
58°
31
73°
59°
1
80°
59°
2
79°
57°
3
79°
56°
4
78°
58°
5
78°
51°
6
79°
50°
7
71°
53°
8
70°
56°
9
71°
54°
10
75°
51°
11
73°
56°
12
72°
51°
13
76°
51°
14
73°
53°
15
72°
55°
16
69°
48°
17
67°
47°
18
Hist. Avg.
68°
49°
19
Hist. Avg.
68°
48°
20
Hist. Avg.
68°
48°
21
Hist. Avg.
67°
48°
22
Hist. Avg.
67°
47°
23
Hist. Avg.
66°
47°
24
Hist. Avg.
66°
46°
25
Hist. Avg.
66°
46°
26
Hist. Avg.
65°
46°
27
Hist. Avg.
65°
45°
28
Hist. Avg.
64°
45°
29
Hist. Avg.
64°
44°
30
Hist. Avg.
64°
44°
1
Hist. Avg.
63°
44°
2
Hist. Avg.
63°
43°
3
Hist. Avg.
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Bar Harbor
Bar Harbor's September 2026 forecast shows daily high temperatures ranging from 67° to 80°, with overnight lows between 47° and 59°. The average high for September is 74° 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 Bar Harbor. See also: October | November | December.
