S
M
T
W
T
F
S
30
64°
48°
31
64°
50°
1
63°
55°
2
61°
55°
3
61°
54°
4
64°
54°
5
63°
50°
6
63°
50°
7
64°
50°
8
68°
50°
9
70°
50°
10
63°
46°
11
63°
45°
12
63°
50°
13
63°
50°
14
64°
48°
15
63°
46°
16
70°
48°
17
61°
50°
18
61°
55°
19
61°
54°
20
61°
54°
21
61°
54°
22
63°
54°
23
63°
46°
24
59°
56°
25
62°
44°
26
65°
47°
27
64°
45°
28
63°
51°
29
63°
52°
30
64°
52°
1
63°
49°
2
60°
48°
3
66°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Siletz
Siletz's September 2026 forecast shows daily high temperatures ranging from 59° to 66°, with overnight lows between 44° and 56°. The average high for September is 63° with an average low of 49°. 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 Siletz. See also: October | November | December.
