S
M
T
W
T
F
S
29
54°
32°
30
55°
38°
1
56°
44°
2
55°
45°
3
56°
45°
4
58°
44°
5
55°
45°
6
57°
44°
7
61°
42°
8
53°
35°
9
53°
30°
10
52°
37°
11
69°
35°
12
70°
30°
13
69°
28°
14
50°
29°
15
52°
28°
16
54°
29°
17
52°
36°
18
54°
44°
19
66°
44°
20
68°
42°
21
68°
40°
22
65°
45°
23
68°
39°
24
69°
27°
25
68°
26°
26
48°
27°
27
50°
28°
28
56°
41°
29
61°
43°
30
65°
44°
31
66°
46°
1
67°
37°
2
69°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Philadelphia
Philadelphia's December 2026 forecast shows daily high temperatures ranging from 48° to 70°, with overnight lows between 26° and 46°. The average high for December is 60° 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 Philadelphia. See also: January | February | March.
