S
M
T
W
T
F
S
29
57°
42°
30
58°
39°
1
56°
32°
2
54°
28°
3
46°
30°
4
45°
36°
5
52°
32°
6
47°
29°
7
44°
36°
8
51°
31°
9
52°
29°
10
44°
24°
11
44°
21°
12
38°
23°
13
36°
22°
14
40°
19°
15
37°
20°
16
34°
20°
17
36°
18°
18
41°
17°
19
37°
20°
20
34°
31°
21
41°
32°
22
43°
31°
23
45°
32°
24
42°
33°
25
50°
31°
26
49°
28°
27
44°
30°
28
Hist. Avg.
41°
23°
29
Hist. Avg.
41°
23°
30
Hist. Avg.
41°
22°
31
Hist. Avg.
40°
22°
1
Hist. Avg.
41°
23°
2
Hist. Avg.
41°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Gwynedd
Gwynedd's December 2026 forecast shows daily high temperatures ranging from 34° to 58°, with overnight lows between 17° and 42°. The average high for December is 45° 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 Gwynedd. See also: January | February | March.
