S
M
T
W
T
F
S
26
59°
40°
27
60°
43°
28
58°
40°
29
56°
42°
30
56°
41°
1
57°
41°
2
56°
42°
3
56°
40°
4
57°
39°
5
56°
39°
6
56°
40°
7
57°
42°
8
58°
47°
9
62°
46°
10
59°
45°
11
59°
46°
12
60°
44°
13
59°
41°
14
62°
44°
15
65°
47°
16
66°
48°
17
66°
48°
18
65°
47°
19
67°
49°
20
63°
49°
21
64°
48°
22
66°
49°
23
66°
48°
24
64°
46°
25
66°
44°
26
67°
48°
27
70°
47°
28
67°
44°
29
66°
50°
30
69°
44°
31
66°
50°
1
69°
47°
2
70°
45°
3
64°
47°
4
64°
46°
5
65°
45°
6
65°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Monmouth/trefynwy
Monmouth/trefynwy's May 2026 forecast shows daily high temperatures ranging from 56° to 70°, with overnight lows between 39° and 50°. The average high for May is 62° with an average low of 45°. 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.
