S
M
T
W
T
F
S
30
71°
55°
31
76°
54°
1
66°
57°
2
70°
55°
3
68°
53°
4
70°
53°
5
70°
52°
6
74°
53°
7
70°
57°
8
74°
55°
9
78°
54°
10
71°
56°
11
67°
52°
12
70°
54°
13
62°
56°
14
70°
52°
15
71°
50°
16
78°
52°
17
80°
52°
18
78°
50°
19
74°
52°
20
70°
51°
21
69°
52°
22
69°
50°
23
70°
51°
24
71°
50°
25
67°
49°
26
63°
51°
27
62°
46°
28
62°
47°
29
61°
48°
30
60°
44°
1
60°
44°
2
61°
45°
3
59°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Seattle East
Seattle East's September 2026 forecast shows daily high temperatures ranging from 59° to 80°, with overnight lows between 43° and 56°. The average high for September is 68° with an average low of 50°. 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 Seattle East. See also: October | November | December.
