Sintra weather in May
May in Sintra: nice, dry, with clean air — one of the best months to visit.
#2 of 12 months in Sintra · #113 of 897 destinations to visit in May · comfort 92/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Sintra in May
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Sintra climate normals — May
| Daytime high | 19°C / 66°F | 😎 nice |
|---|---|---|
| Nighttime low | 15°C / 58°F | |
| Rainfall | 21 mm / 0.8 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 12°C / 54°F | |
| Sunshine | 12.4 h/day | |
| Daylight | 14.3 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sintra in May — FAQ
- Is May a good time to visit Sintra?
- May in Sintra: nice, dry, with clean air — one of the best months to visit. It ranks #2 of 12 months for Sintra on SeasonMap's comfort score (92/100).
- What is the weather like in Sintra in May?
- In May, Sintra averages a daily high of 18.8°C and a low of 14.5°C, with about 20.6 mm of rain over roughly 3.8 rainy days.
- What is the air quality in Sintra in May?
- Sintra has a mean US Air Quality Index of about 41 in May.