S
M
T
W
T
F
S
30
68°
56°
31
71°
54°
1
70°
54°
2
70°
55°
3
65°
54°
4
68°
53°
5
69°
52°
6
69°
52°
7
67°
55°
8
71°
52°
9
75°
53°
10
69°
55°
11
66°
54°
12
65°
52°
13
60°
54°
14
63°
54°
15
66°
54°
16
70°
51°
17
72°
54°
18
68°
52°
19
63°
52°
20
66°
50°
21
68°
52°
22
66°
49°
23
66°
47°
24
60°
48°
25
61°
45°
26
61°
46°
27
66°
52°
28
65°
51°
29
64°
52°
30
63°
50°
1
64°
50°
2
63°
49°
3
61°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Snohomish
Snohomish's September 2026 forecast shows daily high temperatures ranging from 60° to 68°, with overnight lows between 45° and 52°. The average high for September is 64° 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 Snohomish. See also: October | November | December.
