S
M
T
W
T
F
S
30
56°
42°
31
69°
44°
1
68°
50°
2
65°
47°
3
59°
47°
4
59°
48°
5
67°
45°
6
67°
45°
7
64°
48°
8
61°
49°
9
64°
47°
10
64°
46°
11
69°
51°
12
66°
49°
13
64°
48°
14
65°
46°
15
68°
48°
16
59°
46°
17
58°
46°
18
58°
41°
19
59°
48°
20
57°
44°
21
56°
40°
22
56°
40°
23
57°
41°
24
55°
39°
25
55°
39°
26
60°
42°
27
63°
48°
28
56°
47°
29
55°
42°
30
61°
45°
1
60°
47°
2
54°
46°
3
54°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Snoqualmie Pass
Snoqualmie Pass's September 2026 forecast shows daily high temperatures ranging from 54° to 69°, with overnight lows between 39° and 51°. The average high for September is 61° with an average low of 45°. 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 Snoqualmie Pass. See also: October | November | December.
