S
M
T
W
T
F
S
29
49°
32°
30
53°
28°
1
48°
27°
2
40°
29°
3
45°
31°
4
47°
32°
5
49°
37°
6
52°
39°
7
52°
41°
8
55°
37°
9
55°
36°
10
51°
36°
11
48°
28°
12
46°
27°
13
39°
29°
14
41°
26°
15
40°
25°
16
38°
22°
17
37°
23°
18
35°
23°
19
36°
22°
20
36°
26°
21
40°
34°
22
46°
35°
23
51°
32°
24
48°
27°
25
43°
18°
26
39°
17°
27
35°
28°
28
35°
23°
29
43°
18°
30
35°
17°
31
31°
21°
1
33°
27°
2
39°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Horsham
Horsham's December 2026 forecast shows daily high temperatures ranging from 31° to 55°, with overnight lows between 17° and 41°. The average high for December is 43° with an average low of 28°. 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 Horsham. See also: January | February | March.
