S
M
T
W
T
F
S
29
73°
51°
30
69°
53°
1
72°
45°
2
60°
40°
3
59°
39°
4
60°
43°
5
66°
46°
6
61°
40°
7
57°
39°
8
57°
39°
9
55°
38°
10
56°
37°
11
58°
38°
12
59°
38°
13
63°
40°
14
61°
44°
15
61°
44°
16
62°
40°
17
61°
41°
18
64°
38°
19
58°
35°
20
56°
36°
21
57°
37°
22
59°
37°
23
57°
38°
24
56°
36°
25
57°
35°
26
57°
35°
27
58°
36°
28
58°
37°
29
59°
38°
30
56°
37°
31
58°
35°
1
56°
34°
2
56°
36°
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 55° to 73°, with overnight lows between 34° and 53°. The average high for December is 60° with an average low of 39°. 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.
