May · United Kingdom
Best time to visit Cardiff in May Weather, crowds & prices
Weather in Cardiff in May
Average temperature 13°C, 71 mm of rain, about 22 days with 6+ hours of sunshine and 84% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
8.0/10
Ranked #4 of 12 months
- Avg temp
- 13°C
- Rainfall
- 71 mm
- Humidity
- 84%
- Days with 6h+ sun
- 22
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Cardiff scores 8.0/10 for sightseeing and cultural travel - an above-average month (#4 of 12). Expect around 13°C, 71 mm of rain, and roughly 22 days with 6+ hours of sunshine this month.
Cardiff mixes a Victorian arcades core, Cardiff Castle, and bay regeneration with easy access to Welsh coast and valleys. Best window: late spring through early autumn.
May holds up well in Cardiff — 4th best month
Temperatures hover around 13°C (55°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 71 mm of rain this month — a flexible day or two helps — with about 22 days with 6+ hours of sunshine and 15.4 hours of daylight to work around it.
That is 8/10 on the same scale — 4th of 12 months, versus 9/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Budget for mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Cardiff in May?
- In May, Cardiff averages 13°C, 71 mm of rain, and about 22 days with 6+ hours of sunshine. Its climate-comfort score is 8.0/10.
- Is May a good time to visit Cardiff?
- May earns a 8.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cardiff in May?
- Expect about 71 mm of rain in May. Average humidity is 84% and there are about 22 days with 6+ hours of sunshine.
Curated in Cardiff
Tickets & experiences
Things to do in Cardiff
Cardiff, United Kingdom. Live activities and tours from GetYourGuide, matched to this destination.