S
M
T
W
T
F
S
29
70°
48°
30
76°
53°
1
76°
50°
2
77°
41°
3
72°
42°
4
66°
35°
5
61°
33°
6
59°
39°
7
59°
35°
8
57°
34°
9
58°
34°
10
58°
42°
11
61°
45°
12
68°
41°
13
65°
40°
14
58°
38°
15
63°
42°
16
60°
44°
17
62°
45°
18
65°
47°
19
70°
47°
20
70°
46°
21
69°
46°
22
67°
48°
23
73°
45°
24
72°
42°
25
67°
41°
26
64°
45°
27
62°
49°
28
71°
47°
29
71°
45°
30
70°
38°
31
70°
36°
1
62°
36°
2
54°
33°
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 54° to 77°, with overnight lows between 33° and 53°. The average high for December is 66° with an average low of 42°. 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.
