Belfast weather in August
August in Belfast: nice, rainy, with clean air — an excellent time to visit.
#3 of 12 months in Belfast · #294 of 897 destinations to visit in August · comfort 86/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Belfast in August
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Belfast climate normals — August
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 56°F | |
| Rainfall | 101 mm / 4 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 12°C / 54°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 14.9 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Belfast in August — FAQ
- Is August a good time to visit Belfast?
- August in Belfast: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Belfast on SeasonMap's comfort score (86/100).
- What is the weather like in Belfast in August?
- In August, Belfast averages a daily high of 17.9°C and a low of 13.3°C, with about 101.1 mm of rain over roughly 15.4 rainy days.
- What is the air quality in Belfast in August?
- Belfast has a mean US Air Quality Index of about 30 in August.