S
M
T
W
T
F
S
29
62°
45°
30
63°
43°
1
61°
37°
2
58°
29°
3
48°
32°
4
49°
38°
5
53°
36°
6
51°
32°
7
49°
40°
8
54°
32°
9
57°
32°
10
47°
30°
11
45°
26°
12
43°
27°
13
42°
25°
14
44°
24°
15
41°
24°
16
40°
23°
17
41°
23°
18
43°
21°
19
41°
24°
20
40°
31°
21
41°
35°
22
47°
36°
23
49°
36°
24
48°
37°
25
57°
34°
26
55°
31°
27
45°
31°
28
42°
23°
29
Hist. Avg.
46°
32°
30
Hist. Avg.
46°
32°
31
Hist. Avg.
46°
32°
1
Hist. Avg.
46°
32°
2
Hist. Avg.
45°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Washington
Washington's December 2026 forecast shows daily high temperatures ranging from 40° to 63°, with overnight lows between 21° and 45°. The average high for December is 49° with an average low of 31°. 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 Washington. See also: January | February | March.
