San Sebastián weather in August
August in San Sebastián: hot, dry, with clean air — a great time to visit.
#12 of 12 months in San Sebastián · #354 of 604 destinations to visit in August · comfort 76/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
San Sebastián climate normals — August
| Daytime high | 27°C / 80°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 76°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 1 mm / 0 in | ☀️ dry |
| Rainy days | 0 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 21°C / 71°F | |
| Sunshine | 12.1 h/day | |
| Daylight | 13.1 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Sebastián in August — FAQ
- Is August a good time to visit San Sebastián?
- August in San Sebastián: hot, dry, with clean air — a great time to visit. It ranks #12 of 12 months for San Sebastián on SeasonMap's comfort score (76/100).
- What is the weather like in San Sebastián in August?
- In August, San Sebastián averages a daily high of 26.8°C and a low of 24.7°C, with about 0.9 mm of rain over roughly 0.4 rainy days.
- What is the air quality in San Sebastián in August?
- San Sebastián has a mean US Air Quality Index of about 43 in August.