S
M
T
W
T
F
S
29
56°
40°
30
56°
41°
1
55°
35°
2
43°
29°
3
43°
30°
4
50°
35°
5
51°
38°
6
43°
32°
7
41°
26°
8
40°
24°
9
39°
25°
10
40°
30°
11
47°
29°
12
47°
32°
13
46°
27°
14
42°
26°
15
41°
30°
16
41°
33°
17
42°
30°
18
45°
25°
19
41°
24°
20
39°
22°
21
38°
24°
22
39°
29°
23
45°
27°
24
40°
25°
25
38°
23°
26
39°
23°
27
38°
24°
28
38°
23°
29
39°
25°
30
38°
23°
31
39°
21°
1
37°
17°
2
37°
17°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Kelso
Kelso's December 2026 forecast shows daily high temperatures ranging from 37° to 56°, with overnight lows between 17° and 41°. The average high for December is 43° with an average low of 28°. 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 Kelso. See also: January | February | March.
