S
M
T
W
T
F
S
26
64°
45°
27
66°
48°
28
54°
43°
29
66°
39°
30
72°
43°
1
59°
48°
2
61°
46°
3
61°
48°
4
59°
50°
5
59°
48°
6
57°
45°
7
57°
43°
8
64°
46°
9
66°
43°
10
55°
39°
11
54°
39°
12
57°
41°
13
57°
43°
14
52°
43°
15
55°
41°
16
54°
43°
17
54°
45°
18
54°
45°
19
61°
52°
20
57°
52°
21
70°
54°
22
75°
55°
23
68°
52°
24
81°
50°
25
86°
63°
26
88°
64°
27
N/A
28
81°
56°
29
74°
51°
30
75°
56°
31
68°
54°
1
67°
55°
2
67°
51°
3
66°
53°
4
65°
51°
5
64°
50°
6
66°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Monmouth/trefynwy
Monmouth/trefynwy's May 2026 forecast shows daily high temperatures ranging from 64° to 81°, with overnight lows between 50° and 56°. The average high for May is 69° with an average low of 53°. 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 Monmouth/trefynwy. See also: June | July | August.
