S
M
T
W
T
F
S
30
72°
55°
31
72°
58°
1
71°
60°
2
75°
61°
3
80°
56°
4
80°
60°
5
77°
54°
6
71°
53°
7
77°
59°
8
70°
54°
9
69°
57°
10
70°
60°
11
67°
53°
12
68°
56°
13
68°
56°
14
67°
52°
15
65°
48°
16
66°
49°
17
Hist. Avg.
70°
52°
18
Hist. Avg.
70°
52°
19
Hist. Avg.
69°
52°
20
Hist. Avg.
69°
52°
21
Hist. Avg.
69°
52°
22
Hist. Avg.
68°
51°
23
Hist. Avg.
68°
51°
24
Hist. Avg.
68°
51°
25
Hist. Avg.
67°
51°
26
Hist. Avg.
67°
50°
27
Hist. Avg.
67°
50°
28
Hist. Avg.
66°
50°
29
Hist. Avg.
66°
50°
30
Hist. Avg.
66°
49°
1
Hist. Avg.
65°
49°
2
Hist. Avg.
65°
49°
3
Hist. Avg.
64°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in West Seattle
West Seattle's September 2026 forecast shows daily high temperatures ranging from 65° to 80°, with overnight lows between 48° and 61°. The average high for September is 71° with an average low of 56°. 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 West Seattle. See also: October | November | December.
