Sintra weather in September
September in Sintra: nice, a little rain, with clean air — an excellent time to visit.
#5 of 12 months in Sintra · #263 of 897 destinations to visit in September · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
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Sintra climate normals — September
| Daytime high | 21°C / 70°F | 😎 nice |
|---|---|---|
| Nighttime low | 17°C / 63°F | |
| Rainfall | 40 mm / 1.6 in | 🌦 some rain |
| Rainy days | 4 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 16°C / 61°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12.4 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sintra in September — FAQ
- Is September a good time to visit Sintra?
- September in Sintra: nice, a little rain, with clean air — an excellent time to visit. It ranks #5 of 12 months for Sintra on SeasonMap's comfort score (88/100).
- What is the weather like in Sintra in September?
- In September, Sintra averages a daily high of 21.1°C and a low of 17.2°C, with about 40.3 mm of rain over roughly 4.4 rainy days.
- What is the air quality in Sintra in September?
- Sintra has a mean US Air Quality Index of about 38 in September.