S
M
T
W
T
F
S
29
74°
54°
30
79°
54°
1
78°
56°
2
78°
54°
3
79°
52°
4
78°
41°
5
73°
40°
6
68°
40°
7
64°
42°
8
66°
42°
9
68°
41°
10
71°
40°
11
64°
40°
12
64°
41°
13
66°
42°
14
66°
39°
15
65°
40°
16
63°
42°
17
65°
44°
18
66°
43°
19
68°
42°
20
67°
43°
21
68°
51°
22
72°
51°
23
75°
52°
24
74°
49°
25
73°
48°
26
74°
49°
27
72°
49°
28
71°
48°
29
74°
50°
30
75°
50°
31
74°
46°
1
74°
45°
2
70°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Morriston
Morriston's December 2026 forecast shows daily high temperatures ranging from 63° to 79°, with overnight lows between 39° and 56°. The average high for December is 71° with an average low of 46°. 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 Morriston. See also: January | February | March.
