S
M
T
W
T
F
S
29
53°
33°
30
47°
32°
1
46°
36°
2
46°
38°
3
52°
34°
4
51°
35°
5
45°
29°
6
46°
26°
7
45°
27°
8
39°
25°
9
41°
23°
10
40°
24°
11
38°
32°
12
45°
29°
13
49°
36°
14
51°
40°
15
Hist. Avg.
46°
31°
16
Hist. Avg.
46°
31°
17
Hist. Avg.
46°
31°
18
Hist. Avg.
45°
31°
19
Hist. Avg.
45°
30°
20
Hist. Avg.
45°
30°
21
Hist. Avg.
44°
30°
22
Hist. Avg.
44°
30°
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 Swarthmore
Swarthmore's December 2026 forecast shows daily high temperatures ranging from 38° to 53°, with overnight lows between 23° and 40°. The average high for December is 46° with an average low of 31°. 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.
