S
M
T
W
T
F
S
26
64°
45°
27
64°
46°
28
55°
46°
29
66°
45°
30
72°
48°
1
59°
48°
2
61°
46°
3
61°
50°
4
63°
52°
5
59°
52°
6
57°
46°
7
59°
48°
8
65°
49°
9
68°
46°
10
61°
41°
11
58°
43°
12
60°
46°
13
58°
43°
14
52°
41°
15
59°
43°
16
60°
47°
17
60°
46°
18
60°
47°
19
61°
46°
20
60°
47°
21
62°
47°
22
61°
47°
23
61°
49°
24
62°
50°
25
65°
50°
26
68°
49°
27
65°
49°
28
62°
46°
29
64°
46°
30
65°
51°
31
67°
51°
1
68°
50°
2
69°
51°
3
69°
51°
4
65°
52°
5
66°
52°
6
69°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Cardiff
Cardiff's May 2026 forecast shows daily high temperatures ranging from 52° to 69°, with overnight lows between 41° and 52°. The average high for May is 63° with an average low of 48°. 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 Cardiff. See also: June | July | August.
