S
M
T
W
T
F
S
29
48°
44°
30
55°
47°
1
58°
44°
2
59°
38°
3
56°
32°
4
48°
38°
5
47°
41°
6
51°
40°
7
54°
41°
8
53°
40°
9
53°
40°
10
49°
39°
11
52°
40°
12
50°
37°
13
51°
40°
14
52°
32°
15
51°
39°
16
49°
36°
17
54°
28°
18
51°
26°
19
40°
32°
20
44°
33°
21
47°
27°
22
43°
28°
23
Hist. Avg.
44°
30°
24
Hist. Avg.
44°
29°
25
Hist. Avg.
44°
29°
26
Hist. Avg.
44°
29°
27
Hist. Avg.
43°
29°
28
Hist. Avg.
43°
29°
29
Hist. Avg.
43°
28°
30
Hist. Avg.
43°
28°
31
Hist. Avg.
42°
28°
1
Hist. Avg.
42°
28°
2
Hist. Avg.
42°
28°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Philadelphia
Philadelphia's December 2026 forecast shows daily high temperatures ranging from 40° to 59°, with overnight lows between 26° and 47°. The average high for December is 51° 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.
