S
M
T
W
T
F
S
26
53°
37°
27
69°
42°
28
66°
46°
29
60°
49°
30
57°
40°
1
57°
39°
2
56°
40°
3
53°
42°
4
58°
46°
5
63°
49°
6
65°
47°
7
64°
46°
8
60°
48°
9
63°
47°
10
64°
48°
11
64°
48°
12
65°
52°
13
66°
48°
14
65°
46°
15
64°
46°
16
62°
47°
17
63°
46°
18
65°
46°
19
71°
53°
20
70°
50°
21
67°
48°
22
68°
47°
23
67°
48°
24
68°
52°
25
77°
57°
26
75°
50°
27
68°
50°
28
68°
51°
29
71°
54°
30
77°
59°
31
79°
59°
1
78°
58°
2
79°
60°
3
81°
61°
4
81°
60°
5
80°
54°
6
72°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Gwynedd
Gwynedd's May 2026 forecast shows daily high temperatures ranging from 53° to 81°, with overnight lows between 37° and 61°. The average high for May is 67° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Gwynedd. See also: June | July | August.
