S
M
T
W
T
F
S
26
56°
41°
27
56°
41°
28
57°
38°
29
62°
36°
30
61°
33°
1
65°
30°
2
71°
33°
3
75°
35°
4
70°
45°
5
66°
40°
6
55°
35°
7
70°
29°
8
78°
37°
9
77°
35°
10
78°
35°
11
85°
35°
12
91°
43°
13
90°
45°
14
85°
51°
15
84°
42°
16
81°
50°
17
67°
44°
18
50°
39°
19
61°
35°
20
69°
35°
21
74°
37°
22
67°
35°
23
77°
35°
24
83°
44°
25
78°
44°
26
71°
56°
27
84°
50°
28
89°
50°
29
82°
58°
30
69°
48°
31
79°
40°
1
87°
42°
2
89°
45°
3
88°
49°
4
92°
50°
5
93°
51°
6
95°
50°
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 ° to °, with overnight lows between ° and °. The average high for May is ° with an average low of °. 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.
