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Sintra Weather by Month
Average temperatures, rainfall and humidity for Sintra, Portugal, month by month, built from OpenWeather's historical records. Use it to see what a typical Sintra month looks like before you travel — then check the live Sintra forecast for the days ahead.
Warmest month
August
28°C average high
Coolest month
January
8°C average low
Wettest month
October
78 mm of rain
Driest month
August
6 mm of rain
Average temperature and rainfall in Sintra by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 14°C | 8°C | -5°C / 21°C | 69 mm | 80% | 15 km/h |
| February | 15°C | 9°C | -1°C / 23°C | 48 mm | 77% | 16 km/h |
| March | 17°C | 10°C | 2°C / 26°C | 55 mm | 74% | 17 km/h |
| April | 19°C | 11°C | 0°C / 31°C | 60 mm | 73% | 16 km/h |
| May | 22°C | 14°C | 6°C / 34°C | 32 mm | 68% | 18 km/h |
| June | 25°C | 16°C | 10°C / 40°C | 21 mm | 69% | 18 km/h |
| July | 27°C | 18°C | 12°C / 39°C | 8 mm | 68% | 18 km/h |
| August | 28°C | 18°C | 12°C / 43°C | 6 mm | 67% | 19 km/h |
| September | 26°C | 17°C | 7°C / 37°C | 34 mm | 68% | 16 km/h |
| October | 22°C | 15°C | 6°C / 33°C | 78 mm | 75% | 14 km/h |
| November | 17°C | 11°C | 1°C / 24°C | 63 mm | 80% | 14 km/h |
| December | 15°C | 9°C | -2°C / 20°C | 62 mm | 81% | 14 km/h |
Best time to visit Sintra
The most comfortable time to visit Sintra is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around October, totalling about 535 mm a year.
Travellers who prefer heat should aim for August, when highs average 28°C. October is the month to avoid if rain would spoil your plans — it averages 78 mm, roughly 13× the rainfall of August.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Sintra forecast for what is happening now.