S
M
T
W
T
F
S
30
66°
50°
31
74°
47°
1
68°
59°
2
71°
53°
3
64°
51°
4
67°
49°
5
70°
49°
6
71°
51°
7
70°
54°
8
69°
53°
9
67°
54°
10
68°
53°
11
68°
54°
12
66°
54°
13
67°
49°
14
69°
50°
15
68°
54°
16
64°
53°
17
63°
54°
18
63°
53°
19
64°
53°
20
62°
51°
21
62°
49°
22
63°
50°
23
61°
46°
24
61°
46°
25
63°
47°
26
64°
50°
27
68°
52°
28
63°
52°
29
61°
49°
30
65°
51°
1
64°
51°
2
61°
50°
3
63°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bellingham
Bellingham's September 2026 forecast shows daily high temperatures ranging from 61° to 71°, with overnight lows between 46° and 59°. The average high for September is 65° with an average low of 51°. 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 Bellingham. See also: October | November | December.
