S
M
T
W
T
F
S
26
62°
39°
27
72°
35°
28
62°
36°
29
65°
48°
30
65°
47°
1
66°
38°
2
62°
43°
3
61°
40°
4
74°
36°
5
84°
58°
6
69°
53°
7
64°
48°
8
67°
40°
9
63°
47°
10
77°
46°
11
62°
45°
12
68°
38°
13
76°
53°
14
64°
51°
15
66°
47°
16
82°
44°
17
89°
59°
18
96°
68°
19
98°
71°
20
93°
54°
21
67°
51°
22
62°
50°
23
58°
53°
24
66°
58°
25
76°
57°
26
75°
56°
27
73°
57°
28
77°
58°
29
79°
57°
30
77°
58°
31
82°
56°
1
77°
59°
2
74°
58°
3
71°
60°
4
73°
60°
5
76°
58°
6
75°
60°
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 58° to 98°, with overnight lows between 50° and 71°. The average high for May is 76° with an average low of 58°. 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.
