Climate Insights for Sintra

The climate in Sintra is temperate. The average annual temperature is 16°C and approximately 577mm of precipitation falls per year. November is the wettest month, receiving around 92mm of rainfall. Sintra is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, August, October. The coldest months are January, February, March, when temperatures can drop to 13°C.

Sintra has relatively stable temperatures year-round, staying within a 6°C range. September is the warmest month, though highs remain moderate at 19°C with a mean of 18°C. January is the coolest month, with minimum temperatures around 13°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.

Sintra is a relatively dry area, receiving approximately 577mm of precipitation annually, which averages out to around 48mm per month. The wettest month is November, averaging 92mm of rainfall. December and March also tend to see above-average precipitation. The driest month is August, with just 1mm. That's 91mm less than November, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Sintra is moderately windy, with an average annual wind speed of 23km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 25km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in October, with average winds dropping to 20km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months.

It is currently autumn in Sintra, which began on September 23, 2026. Sintra is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 19°C, while the coldest stretch bottoms out in January near 13°C. Winter is next, beginning on December 21, 2026 (87 days from now).

The best time to visit Sintra is during May, June, July, August, September, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 33mm per month. By contrast, January can be quite cold with temperatures dropping to 13°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Sintra based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.