S
M
T
W
T
F
S
30
79°
54°
31
75°
52°
1
73°
48°
2
69°
48°
3
64°
58°
4
77°
61°
5
69°
53°
6
66°
51°
7
77°
45°
8
74°
46°
9
64°
42°
10
80°
60°
11
71°
51°
12
69°
44°
13
64°
56°
14
69°
53°
15
69°
43°
16
66°
47°
17
69°
53°
18
74°
53°
19
64°
44°
20
59°
41°
21
66°
44°
22
63°
41°
23
63°
41°
24
64°
45°
25
68°
52°
26
66°
53°
27
68°
50°
28
68°
48°
29
66°
49°
30
69°
50°
1
65°
49°
2
68°
45°
3
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Birch Harbor
Birch Harbor's September 2026 forecast shows daily high temperatures ranging from 62° to 69°, with overnight lows between 41° and 53°. The average high for September is 66° with an average low of 47°. 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 Birch Harbor. See also: October | November | December.
