S
M
T
W
T
F
S
29
48°
31°
30
45°
31°
1
43°
33°
2
49°
22°
3
47°
20°
4
45°
20°
5
39°
21°
6
40°
20°
7
41°
18°
8
42°
17°
9
40°
16°
10
37°
17°
11
36°
18°
12
38°
18°
13
39°
20°
14
40°
20°
15
42°
23°
16
44°
24°
17
43°
28°
18
44°
29°
19
42°
27°
20
43°
22°
21
40°
22°
22
41°
28°
23
41°
18°
24
42°
17°
25
35°
17°
26
36°
18°
27
36°
17°
28
35°
16°
29
37°
21°
30
37°
24°
31
Hist. Avg.
40°
23°
1
Hist. Avg.
42°
23°
2
Hist. Avg.
42°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Washington
Washington's December 2026 forecast shows daily high temperatures ranging from 35° to 49°, with overnight lows between 16° and 33°. The average high for December is 41° with an average low of 22°. 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.
