S
M
T
W
T
F
S
31
79°
56°
1
74°
57°
2
81°
55°
3
86°
56°
4
80°
57°
5
77°
58°
6
76°
56°
7
72°
59°
8
77°
58°
9
74°
53°
10
77°
53°
11
69°
55°
12
73°
57°
13
80°
49°
14
70°
52°
15
72°
52°
16
91°
47°
17
81°
51°
18
74°
49°
19
77°
42°
20
76°
45°
21
71°
52°
22
73°
45°
23
78°
45°
24
76°
45°
25
65°
43°
26
73°
43°
27
78°
52°
28
73°
48°
29
67°
54°
30
70°
45°
1
66°
53°
2
69°
47°
3
66°
44°
4
66°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Steilacoom
Steilacoom's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
