S
M
T
W
T
F
S
30
73°
49°
31
80°
47°
1
69°
50°
2
70°
52°
3
68°
52°
4
72°
51°
5
73°
46°
6
76°
48°
7
70°
51°
8
75°
51°
9
80°
55°
10
71°
51°
11
70°
51°
12
67°
49°
13
71°
50°
14
76°
52°
15
73°
53°
16
73°
51°
17
72°
52°
18
70°
51°
19
71°
52°
20
68°
51°
21
66°
54°
22
64°
50°
23
63°
48°
24
66°
49°
25
68°
54°
26
63°
52°
27
62°
49°
28
61°
46°
29
60°
44°
30
61°
46°
1
66°
50°
2
69°
52°
3
67°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Steilacoom
Steilacoom's September 2026 forecast shows daily high temperatures ranging from 60° to 80°, with overnight lows between 44° and 55°. The average high for September is 68° with an average low of 51°. 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 Steilacoom. See also: October | November | December.
