S
M
T
W
T
F
S
30
66°
50°
31
74°
47°
1
68°
51°
2
71°
60°
3
68°
49°
4
66°
47°
5
70°
50°
6
70°
44°
7
67°
55°
8
72°
53°
9
72°
50°
10
70°
50°
11
66°
48°
12
70°
48°
13
63°
57°
14
65°
53°
15
69°
50°
16
71°
44°
17
71°
44°
18
67°
43°
19
64°
45°
20
68°
44°
21
66°
45°
22
67°
54°
23
62°
43°
24
60°
42°
25
56°
52°
26
62°
42°
27
64°
41°
28
62°
56°
29
61°
46°
30
64°
50°
1
61°
47°
2
64°
45°
3
64°
47°
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 64°, with overnight lows between 45° and 56°. The average high for September is 63° with an average low of 49°. 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.
