S
M
T
W
T
F
S
26
69°
54°
27
76°
54°
28
75°
51°
29
80°
52°
30
80°
53°
31
79°
51°
1
77°
53°
2
78°
52°
3
82°
52°
4
85°
55°
5
84°
55°
6
79°
54°
7
82°
57°
8
79°
55°
9
77°
57°
10
77°
56°
11
82°
57°
12
83°
58°
13
84°
59°
14
83°
58°
15
83°
57°
16
82°
55°
17
79°
51°
18
74°
50°
19
79°
52°
20
78°
51°
21
78°
51°
22
73°
52°
23
75°
50°
24
81°
56°
25
81°
55°
26
80°
55°
27
80°
54°
28
79°
55°
29
80°
54°
30
80°
53°
31
79°
55°
1
81°
55°
2
80°
54°
3
81°
54°
4
79°
54°
5
80°
50°
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 69° to 85°, with overnight lows between 50° and 59°. The average high for August is 79° with an average low of 54°. 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.
