S
M
T
W
T
F
S
30
80°
60°
31
79°
59°
1
78°
57°
2
78°
53°
3
77°
50°
4
79°
51°
5
76°
50°
6
68°
48°
7
67°
52°
8
67°
57°
9
66°
57°
10
67°
53°
11
67°
47°
12
66°
51°
13
65°
54°
14
66°
51°
15
65°
49°
16
64°
48°
17
66°
50°
18
70°
54°
19
74°
50°
20
73°
49°
21
68°
45°
22
63°
44°
23
63°
47°
24
64°
46°
25
61°
45°
26
62°
46°
27
62°
49°
28
63°
47°
29
61°
47°
30
61°
46°
1
62°
50°
2
64°
53°
3
68°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bainbridge Island
Bainbridge Island's September 2026 forecast shows daily high temperatures ranging from 61° to 80°, with overnight lows between 44° and 60°. The average high for September is 68° 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 Bainbridge Island. See also: October | November | December.
