S
M
T
W
T
F
S
29
68°
46°
30
65°
48°
1
68°
43°
2
55°
36°
3
54°
33°
4
55°
36°
5
62°
41°
6
56°
35°
7
53°
36°
8
52°
33°
9
51°
33°
10
50°
32°
11
52°
32°
12
53°
33°
13
59°
35°
14
55°
37°
15
56°
42°
16
56°
37°
17
57°
36°
18
60°
34°
19
53°
30°
20
51°
30°
21
51°
32°
22
53°
33°
23
52°
33°
24
50°
31°
25
51°
31°
26
50°
32°
27
52°
30°
28
52°
31°
29
53°
35°
30
51°
32°
31
51°
31°
1
50°
29°
2
49°
30°
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 49° to 68°, with overnight lows between 29° and 48°. The average high for December is 54° with an average low of 35°. 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.
