S
M
T
W
T
F
S
30
70°
48°
31
71°
51°
1
70°
57°
2
68°
57°
3
68°
56°
4
68°
55°
5
67°
52°
6
69°
50°
7
68°
49°
8
69°
51°
9
70°
48°
10
72°
47°
11
70°
52°
12
64°
48°
13
65°
54°
14
68°
49°
15
64°
48°
16
Hist. Avg.
70°
51°
17
Hist. Avg.
69°
51°
18
Hist. Avg.
69°
51°
19
Hist. Avg.
68°
51°
20
Hist. Avg.
68°
50°
21
Hist. Avg.
68°
50°
22
Hist. Avg.
68°
50°
23
Hist. Avg.
67°
50°
24
Hist. Avg.
67°
50°
25
Hist. Avg.
66°
50°
26
Hist. Avg.
66°
49°
27
Hist. Avg.
66°
49°
28
Hist. Avg.
65°
49°
29
Hist. Avg.
65°
49°
30
Hist. Avg.
65°
49°
1
Hist. Avg.
64°
49°
2
Hist. Avg.
64°
48°
3
Hist. Avg.
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Steilacoom
Steilacoom's September 2026 forecast shows daily high temperatures ranging from 64° to 72°, with overnight lows between 47° and 57°. 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.
