S
M
T
W
T
F
S
29
44°
31°
30
44°
32°
1
53°
28°
2
47°
32°
3
46°
26°
4
57°
23°
5
54°
23°
6
39°
24°
7
41°
25°
8
42°
22°
9
41°
20°
10
39°
20°
11
36°
22°
12
36°
23°
13
38°
22°
14
38°
23°
15
37°
26°
16
39°
26°
17
39°
24°
18
40°
33°
19
43°
30°
20
44°
26°
21
41°
24°
22
38°
21°
23
37°
20°
24
38°
24°
25
36°
23°
26
37°
24°
27
35°
24°
28
37°
23°
29
35°
20°
30
37°
19°
31
40°
14°
1
Hist. Avg.
39°
24°
2
Hist. Avg.
39°
24°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Bethlehem
Bethlehem's December 2026 forecast shows daily high temperatures ranging from 35° to 57°, with overnight lows between 14° and 33°. The average high for December is 41° with an average low of 24°. 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 Bethlehem. See also: January | February | March.
