San Sebastián weather in April
April in San Sebastián: warm, dry, with clean air — one of the best months to visit.
#1 of 12 months in San Sebastián · #71 of 604 destinations to visit in April · comfort 90/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
San Sebastián climate normals — April
| Daytime high | 22°C / 71°F | 🌤 warm |
|---|---|---|
| Nighttime low | 19°C / 67°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 5 mm / 0.2 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 15°C / 60°F | |
| Sunshine | 11.8 h/day | |
| Daylight | 12.8 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is San Sebastián?
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San Sebastián in April — FAQ
- Is April a good time to visit San Sebastián?
- April in San Sebastián: warm, dry, with clean air — one of the best months to visit. It ranks #1 of 12 months for San Sebastián on SeasonMap's comfort score (90/100).
- What is the weather like in San Sebastián in April?
- In April, San Sebastián averages a daily high of 21.6°C and a low of 19.2°C, with about 5 mm of rain over roughly 1 rainy days.
- What is the air quality in San Sebastián in April?
- San Sebastián has a mean US Air Quality Index of about 45 in April.