S
M
T
W
T
F
S
29
43°
30°
30
42°
29°
1
42°
28°
2
41°
29°
3
42°
31°
4
44°
32°
5
44°
32°
6
43°
36°
7
43°
36°
8
45°
35°
9
44°
29°
10
40°
27°
11
51°
31°
12
49°
34°
13
44°
32°
14
50°
29°
15
44°
25°
16
40°
23°
17
38°
28°
18
39°
31°
19
44°
31°
20
45°
32°
21
45°
32°
22
48°
31°
23
48°
33°
24
47°
35°
25
51°
25°
26
51°
25°
27
49°
23°
28
36°
25°
29
37°
30°
30
45°
30°
31
45°
32°
1
47°
34°
2
49°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Southampton
Southampton's December 2026 forecast shows daily high temperatures ranging from 36° to 51°, with overnight lows between 23° and 36°. The average high for December is 44° with an average low of 30°. 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 Southampton. See also: January | February | March.
