S
M
T
W
T
F
S
30
72°
48°
31
81°
54°
1
66°
55°
2
64°
55°
3
63°
52°
4
72°
48°
5
72°
46°
6
75°
50°
7
70°
54°
8
75°
48°
9
82°
48°
10
68°
50°
11
66°
48°
12
64°
50°
13
64°
54°
14
66°
52°
15
68°
50°
16
77°
46°
17
81°
46°
18
70°
48°
19
68°
46°
20
72°
48°
21
72°
46°
22
70°
48°
23
66°
45°
24
64°
46°
25
61°
48°
26
64°
45°
27
68°
45°
28
68°
39°
29
64°
54°
30
68°
48°
1
72°
46°
2
72°
50°
3
70°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chehalis
Chehalis's September 2026 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 Chehalis. See also: October | November | December.
