Cardiff weather in August
August in Cardiff: nice, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Cardiff · #170 of 897 destinations to visit in August · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cardiff in August
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Cardiff climate normals — August
| Daytime high | 20°C / 68°F | 😎 nice |
|---|---|---|
| Nighttime low | 14°C / 58°F | |
| Rainfall | 89 mm / 3.5 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 13°C / 56°F | |
| Sunshine | 10 h/day | |
| Daylight | 14.5 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cardiff in August — FAQ
- Is August a good time to visit Cardiff?
- August in Cardiff: nice, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Cardiff on SeasonMap's comfort score (89/100).
- What is the weather like in Cardiff in August?
- In August, Cardiff averages a daily high of 20°C and a low of 14.3°C, with about 89.1 mm of rain over roughly 12.2 rainy days.
- What is the air quality in Cardiff in August?
- Cardiff has a mean US Air Quality Index of about 32 in August.