S
M
T
W
T
F
S
30
68°
56°
31
78°
56°
1
75°
50°
2
75°
55°
3
70°
50°
4
70°
48°
5
75°
56°
6
77°
54°
7
65°
51°
8
76°
57°
9
76°
48°
10
74°
51°
11
56°
40°
12
56°
43°
13
50°
39°
14
53°
34°
15
56°
37°
16
66°
35°
17
71°
32°
18
73°
35°
19
70°
38°
20
62°
38°
21
60°
33°
22
62°
34°
23
63°
33°
24
57°
32°
25
49°
35°
26
50°
33°
27
49°
28°
28
48°
28°
29
47°
26°
30
47°
26°
1
48°
35°
2
49°
34°
3
47°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in East Whatcom
East Whatcom's September 2026 forecast shows daily high temperatures ranging from 47° to 73°, with overnight lows between 26° and 43°. The average high for September is 56° with an average low of 34°. 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 East Whatcom. See also: October | November | December.
