San Sebastián weather in May
May in San Sebastián: warm, dry, with clean air — an excellent time to visit.
#3 of 12 months in San Sebastián · #116 of 604 destinations to visit in May · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
San Sebastián climate normals — May
| Daytime high | 23°C / 73°F | 🌤 warm |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 26°C / 79°F | |
| Rainfall | 2 mm / 0.1 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 17°C / 62°F | |
| Sunshine | 12.3 h/day | |
| Daylight | 13.5 h | |
| Wind | 22 km/h / 14 mph | |
| Air quality (US AQI) | 41 | 🍃 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 May — FAQ
- Is May a good time to visit San Sebastián?
- May in San Sebastián: warm, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for San Sebastián on SeasonMap's comfort score (89/100).
- What is the weather like in San Sebastián in May?
- In May, San Sebastián averages a daily high of 23°C and a low of 20.7°C, with about 2.3 mm of rain over roughly 0.8 rainy days.
- What is the air quality in San Sebastián in May?
- San Sebastián has a mean US Air Quality Index of about 41 in May.