S
M
T
W
T
F
S
30
79°
54°
31
80°
53°
1
79°
51°
2
76°
59°
3
67°
63°
4
85°
62°
5
75°
56°
6
74°
51°
7
83°
51°
8
81°
54°
9
69°
48°
10
87°
68°
11
76°
51°
12
73°
43°
13
67°
56°
14
72°
47°
15
72°
41°
16
72°
52°
17
77°
55°
18
79°
52°
19
69°
45°
20
62°
40°
21
71°
49°
22
69°
43°
23
69°
40°
24
72°
38°
25
71°
57°
26
66°
55°
27
61°
54°
28
60°
55°
29
64°
54°
30
67°
53°
1
71°
57°
2
71°
56°
3
67°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Boothbay Harbor
Boothbay Harbor's September 2026 forecast shows daily high temperatures ranging from 60° to 71°, with overnight lows between 50° and 57°. The average high for September is 66° 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 September weather will actually feel in Boothbay Harbor. See also: October | November | December.
