S
M
T
W
T
F
S
29
46°
30°
30
45°
29°
1
45°
29°
2
46°
30°
3
45°
32°
4
47°
34°
5
48°
36°
6
45°
37°
7
44°
35°
8
43°
36°
9
44°
32°
10
44°
33°
11
56°
39°
12
50°
38°
13
57°
33°
14
58°
30°
15
44°
28°
16
45°
29°
17
44°
30°
18
45°
37°
19
51°
38°
20
54°
39°
21
55°
38°
22
55°
36°
23
54°
38°
24
55°
39°
25
58°
32°
26
58°
28°
27
46°
28°
28
45°
32°
29
46°
35°
30
52°
37°
31
52°
39°
1
55°
40°
2
55°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Washington
Washington's December 2026 forecast shows daily high temperatures ranging from 43° to 58°, with overnight lows between 28° and 40°. The average high for December is 49° 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 Washington. See also: January | February | March.
