Sintra weather in December
December in Sintra: cool, rainy, with clean air — a great time to visit.
#12 of 12 months in Sintra · #396 of 897 destinations to visit in December · comfort 75/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Sintra in December
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Sintra climate normals — December
| Daytime high | 15°C / 59°F | 🙂 cool |
|---|---|---|
| Nighttime low | 12°C / 53°F | |
| Rainfall | 96 mm / 3.8 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 11°C / 51°F | |
| Sunshine | 6.8 h/day | |
| Daylight | 9.5 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sintra in December — FAQ
- Is December a good time to visit Sintra?
- December in Sintra: cool, rainy, with clean air — a great time to visit. It ranks #12 of 12 months for Sintra on SeasonMap's comfort score (75/100).
- What is the weather like in Sintra in December?
- In December, Sintra averages a daily high of 15°C and a low of 11.8°C, with about 96.4 mm of rain over roughly 10.2 rainy days.
- What is the air quality in Sintra in December?
- Sintra has a mean US Air Quality Index of about 37 in December.