S
M
T
W
T
F
S
30
84°
59°
31
83°
52°
1
81°
51°
2
77°
53°
3
76°
52°
4
77°
52°
5
76°
51°
6
75°
50°
7
76°
50°
8
76°
51°
9
75°
55°
10
74°
50°
11
77°
50°
12
78°
52°
13
76°
53°
14
77°
52°
15
73°
49°
16
73°
48°
17
71°
47°
18
72°
49°
19
72°
49°
20
75°
52°
21
76°
52°
22
Hist. Avg.
73°
52°
23
Hist. Avg.
73°
52°
24
Hist. Avg.
72°
51°
25
Hist. Avg.
72°
51°
26
Hist. Avg.
72°
50°
27
Hist. Avg.
71°
50°
28
Hist. Avg.
71°
50°
29
Hist. Avg.
70°
49°
30
Hist. Avg.
70°
49°
1
Hist. Avg.
70°
48°
2
Hist. Avg.
69°
48°
3
Hist. Avg.
69°
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 71° to 84°, with overnight lows between 47° and 59°. The average high for September is 76° 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.
