S
M
T
W
T
F
S
29
43°
31°
30
42°
31°
1
43°
38°
2
48°
39°
3
47°
35°
4
46°
33°
5
48°
31°
6
48°
31°
7
47°
32°
8
47°
37°
9
48°
35°
10
47°
30°
11
47°
30°
12
46°
31°
13
48°
37°
14
44°
36°
15
51°
35°
16
48°
40°
17
47°
38°
18
48°
37°
19
50°
38°
20
48°
37°
21
47°
39°
22
48°
38°
23
48°
35°
24
46°
31°
25
47°
29°
26
46°
29°
27
40°
28°
28
39°
31°
29
40°
28°
30
41°
33°
31
43°
39°
1
47°
33°
2
47°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Chehalis
Chehalis's December 2026 forecast shows daily high temperatures ranging from 39° to 51°, with overnight lows between 28° and 40°. The average high for December is 46° with an average low of 34°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Chehalis. See also: January | February | March.
