S
M
T
W
T
F
S
30
72°
55°
31
79°
52°
1
73°
52°
2
72°
53°
3
71°
59°
4
75°
58°
5
78°
57°
6
78°
59°
7
69°
52°
8
68°
52°
9
69°
51°
10
70°
55°
11
76°
58°
12
74°
58°
13
68°
59°
14
68°
60°
15
67°
58°
16
67°
57°
17
68°
55°
18
66°
55°
19
65°
51°
20
66°
49°
21
67°
48°
22
65°
49°
23
65°
49°
24
68°
53°
25
72°
55°
26
72°
55°
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 79°, with overnight lows between 48° and 60°. The average high for September is 70° with an average low of 54°. 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.
