S
M
T
W
T
F
S
29
49°
40°
30
53°
43°
1
55°
42°
2
54°
42°
3
56°
41°
4
49°
38°
5
53°
35°
6
52°
40°
7
54°
37°
8
46°
34°
9
44°
31°
10
42°
29°
11
41°
35°
12
43°
35°
13
45°
33°
14
40°
28°
15
43°
30°
16
42°
33°
17
45°
34°
18
42°
36°
19
51°
33°
20
48°
23°
21
42°
25°
22
37°
26°
23
35°
31°
24
40°
30°
25
50°
29°
26
49°
24°
27
40°
23°
28
36°
24°
29
38°
24°
30
40°
34°
31
48°
30°
1
52°
23°
2
45°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Swarthmore
Swarthmore's December 2026 forecast shows daily high temperatures ranging from 35° to 56°, with overnight lows between 20° and 43°. The average high for December is 46° with an average low of 32°. 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 Swarthmore. See also: January | February | March.
