S
M
T
W
T
F
S
29
60°
46°
30
64°
46°
1
64°
45°
2
65°
46°
3
63°
44°
4
52°
41°
5
59°
44°
6
61°
44°
7
60°
42°
8
53°
40°
9
51°
38°
10
50°
36°
11
52°
35°
12
49°
35°
13
50°
34°
14
53°
30°
15
48°
38°
16
52°
42°
17
63°
41°
18
61°
42°
19
60°
36°
20
59°
27°
21
58°
28°
22
46°
31°
23
49°
41°
24
60°
31°
25
63°
30°
26
48°
31°
27
49°
34°
28
48°
35°
29
50°
40°
30
54°
42°
31
62°
31°
1
62°
27°
2
50°
24°
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 46° to 65°, with overnight lows between 24° and 46°. The average high for December is 56° with an average low of 37°. 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.
