Weather in Cardiff, Wales, United Kingdom in May
In an average May, Cardiff sees a daily high around 15°C and a low around 8°C, based on 1981–2026 of local climate records.
| Average high | 15°C |
|---|---|
| Typical high range | 12°C to 19°C |
| Average low | 8°C |
| Typical low range | 5°C to 10°C |
| Average daily precipitation | 3 mm |
May records
The most extreme May on record for each metric, across 1981–2026. For rainfall, the wettest and driest are by total May accumulation.
High
Highest
29°C
2026-05-26
Lowest
7°C
1997-05-06
Low
Highest
15°C
2026-05-27
Lowest
1°C
1996-05-11
Feels-like
Highest
32°C
2026-05-26
Lowest
-5°C
1996-05-08
Humidity
Highest
13.9 g/m³
2026-05-27
Lowest
4.7 g/m³
1996-05-04
Wind
Highest
59 km/h
2021-05-03
Lowest
7 km/h
2024-05-09
Precip
Wettest
143 mm
2021
Driest
11 mm
2020
See Cardiff's live weather grade →
Visiting Cardiff in May? See how its comfort stacks up against where you live.
Compare Cardiff with your city →