S
M
T
W
T
F
S
30
70°
53°
31
76°
49°
1
74°
48°
2
69°
52°
3
68°
56°
4
74°
54°
5
75°
51°
6
75°
55°
7
67°
48°
8
65°
48°
9
66°
47°
10
69°
49°
11
73°
53°
12
73°
54°
13
66°
55°
14
64°
56°
15
64°
54°
16
65°
53°
17
64°
53°
18
63°
51°
19
62°
49°
20
63°
45°
21
64°
44°
22
62°
46°
23
63°
47°
24
66°
49°
25
69°
51°
26
67°
45°
27
62°
52°
28
60°
51°
29
Hist. Avg.
64°
47°
30
Hist. Avg.
64°
46°
1
Hist. Avg.
64°
46°
2
Hist. Avg.
63°
46°
3
Hist. Avg.
63°
46°
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 60° to 76°, with overnight lows between 44° and 56°. The average high for September is 67° 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.
