S
M
T
W
T
F
S
29
38°
24°
30
36°
25°
1
39°
27°
2
39°
34°
3
43°
35°
4
45°
36°
5
47°
32°
6
47°
26°
7
43°
31°
8
39°
30°
9
48°
34°
10
40°
26°
11
Hist. Avg.
41°
28°
12
Hist. Avg.
41°
27°
13
Hist. Avg.
41°
27°
14
Hist. Avg.
41°
27°
15
Hist. Avg.
41°
27°
16
Hist. Avg.
40°
27°
17
Hist. Avg.
40°
27°
18
Hist. Avg.
40°
27°
19
Hist. Avg.
40°
27°
20
Hist. Avg.
40°
27°
21
Hist. Avg.
40°
27°
22
Hist. Avg.
40°
26°
23
Hist. Avg.
40°
26°
24
Hist. Avg.
40°
26°
25
Hist. Avg.
40°
26°
26
Hist. Avg.
40°
26°
27
Hist. Avg.
40°
26°
28
Hist. Avg.
40°
26°
29
Hist. Avg.
40°
27°
30
Hist. Avg.
40°
27°
31
Hist. Avg.
40°
27°
1
Hist. Avg.
40°
27°
2
Hist. Avg.
40°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Kennewick
Kennewick's December 2026 forecast shows daily high temperatures ranging from 36° to 48°, with overnight lows between 24° and 36°. The average high for December is 42° with an average low of 30°. 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 Kennewick. See also: January | February | March.
