S
M
T
W
T
F
S
30
87°
66°
31
87°
61°
1
81°
53°
2
87°
59°
3
96°
65°
4
85°
63°
5
89°
63°
6
81°
67°
7
83°
64°
8
88°
56°
9
79°
54°
10
85°
47°
11
90°
65°
12
73°
48°
13
71°
45°
14
64°
46°
15
73°
47°
16
76°
42°
17
74°
57°
18
62°
59°
19
61°
57°
20
68°
52°
21
59°
51°
22
69°
47°
23
75°
48°
24
62°
59°
25
66°
59°
26
66°
60°
27
N/A
28
73°
62°
29
67°
56°
30
74°
47°
1
67°
43°
2
64°
47°
3
66°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Bellingham
Bellingham's September 2026 forecast shows daily high temperatures ranging from 64° to 74°, with overnight lows between 43° and 62°. The average high for September is 69° 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 Bellingham. See also: October | November | December.
