S
M
T
W
T
F
S
26
79°
50°
27
82°
50°
28
79°
51°
29
77°
54°
30
75°
56°
31
74°
50°
1
76°
49°
2
76°
50°
3
77°
54°
4
77°
57°
5
83°
57°
6
83°
54°
7
82°
57°
8
83°
50°
9
75°
52°
10
78°
52°
11
80°
51°
12
79°
50°
13
78°
57°
14
82°
55°
15
84°
51°
16
84°
50°
17
83°
55°
18
83°
55°
19
75°
57°
20
75°
46°
21
74°
51°
22
75°
52°
23
79°
54°
24
81°
48°
25
82°
48°
26
81°
54°
27
75°
50°
28
71°
48°
29
71°
46°
30
74°
48°
31
77°
50°
1
73°
49°
2
71°
47°
3
73°
46°
4
72°
46°
5
74°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Chehalis
Chehalis's August 2026 forecast shows daily high temperatures ranging from 71° to 84°, with overnight lows between 46° and 57°. The average high for August is 78° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Chehalis. See also: September | October | November.
