S
M
T
W
T
F
S
30
69°
51°
31
72°
49°
1
66°
50°
2
68°
50°
3
65°
48°
4
68°
47°
5
69°
50°
6
70°
54°
7
67°
52°
8
74°
50°
9
74°
49°
10
69°
50°
11
66°
52°
12
67°
50°
13
66°
49°
14
67°
50°
15
66°
51°
16
69°
51°
17
70°
50°
18
69°
51°
19
63°
48°
20
62°
47°
21
63°
49°
22
61°
50°
23
64°
46°
24
61°
48°
25
58°
48°
26
59°
47°
27
59°
44°
28
58°
44°
29
57°
41°
30
57°
41°
1
58°
47°
2
60°
47°
3
58°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sequim
Sequim's September 2026 forecast shows daily high temperatures ranging from 57° to 70°, with overnight lows between 41° and 52°. The average high for September is 63° with an average low of 48°. 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 Sequim. See also: October | November | December.
