August · United Kingdom
Best time to visit Cardiff in August Weather, crowds & prices
Weather in Cardiff in August
Average temperature 17°C, 54 mm of rain, about 16 days with 6+ hours of sunshine and 81% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
8.5/10
Ranked #2 of 12 months
- Avg temp
- 17°C
- Rainfall
- 54 mm
- Humidity
- 81%
- Days with 6h+ sun
- 16
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in Cardiff scores 8.5/10 for sightseeing and cultural travel - one of the top 12-month picks (#2). Expect around 17°C, 54 mm of rain, and roughly 16 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.
August in Cardiff — one of the year's strongest windows (2nd)
Temperatures hover around 17°C (63°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 54 mm of rain this month — a flexible day or two helps — with about 16 days with 6+ hours of sunshine and 14.4 hours of daylight to work around it.
On our climate-comfort scale this is one of the strongest months of the year for Cardiff at 8.5/10 (2nd of 12), just behind June at 9/10.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Cardiff in August?
- In August, Cardiff averages 17°C, 54 mm of rain, and about 16 days with 6+ hours of sunshine. Its climate-comfort score is 8.5/10.
- Is August a good time to visit Cardiff?
- August earns a 8.5/10 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 August?
- Expect about 54 mm of rain in August. Average humidity is 81% and there are about 16 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.