S
M
T
W
T
F
S
29
42°
27°
30
41°
26°
1
41°
25°
2
40°
25°
3
40°
27°
4
42°
28°
5
43°
30°
6
42°
34°
7
40°
34°
8
39°
33°
9
39°
26°
10
38°
26°
11
50°
33°
12
46°
34°
13
49°
28°
14
50°
26°
15
40°
23°
16
37°
24°
17
37°
26°
18
38°
31°
19
44°
32°
20
46°
33°
21
48°
33°
22
49°
32°
23
47°
33°
24
48°
36°
25
51°
27°
26
51°
25°
27
46°
23°
28
37°
26°
29
38°
30°
30
46°
31°
31
45°
33°
1
48°
35°
2
49°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Gwynedd
Gwynedd's December 2026 forecast shows daily high temperatures ranging from 37° to 51°, with overnight lows between 23° and 36°. The average high for December is 44° with an average low of 29°. 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 Gwynedd. See also: January | February | March.
