S
M
T
W
T
F
S
30
77°
60°
31
77°
59°
1
76°
58°
2
75°
55°
3
73°
55°
4
71°
57°
5
68°
49°
6
67°
56°
7
67°
57°
8
72°
57°
9
74°
58°
10
65°
52°
11
64°
54°
12
65°
54°
13
69°
58°
14
73°
57°
15
74°
52°
16
65°
48°
17
64°
53°
18
68°
52°
19
71°
51°
20
Hist. Avg.
67°
52°
21
Hist. Avg.
66°
52°
22
Hist. Avg.
66°
51°
23
Hist. Avg.
66°
51°
24
Hist. Avg.
65°
51°
25
Hist. Avg.
65°
51°
26
Hist. Avg.
65°
50°
27
Hist. Avg.
64°
50°
28
Hist. Avg.
64°
50°
29
Hist. Avg.
64°
50°
30
Hist. Avg.
63°
50°
1
Hist. Avg.
63°
49°
2
Hist. Avg.
62°
49°
3
Hist. Avg.
62°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Seattle Heights
Seattle Heights's September 2026 forecast shows daily high temperatures ranging from 64° to 77°, with overnight lows between 48° and 60°. The average high for September is 70° with an average low of 55°. 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 Heights. See also: October | November | December.
