Short answer
- Best month
- Junethen July, May
- Mean temperature
- 18.9 °Caverage of day and night
- Rain
- 0.4 mmper day, on average
- How busy
- 78%of August, the busiest month
Lowest scores: January, November, December. That is too cold, too wet or too full by our rule, not closed.
The year at a glance
Each bar is one month. The taller the bar, the better the month by our score. The three orange bars are our picks.
Month by month
| Month | Mean temp | Rain a day | How busy | Score |
|---|---|---|---|---|
| January | 11.6 °C | 2.3 mm | 41% | 0.15 |
| February | 11.7 °C | 1.9 mm | 45% | 0.18 |
| March | 13.1 °C | 2.0 mm | 57% | 0.20 |
| April | 14.6 °C | 1.9 mm | 73% | 0.22 |
| May | 16.7 °C | 1.1 mm | 79% | 0.34 |
| June | 18.9 °C | 0.4 mm | 78% | 0.42 |
| July | 20.1 °C | 0.1 mm | 90% | 0.36 |
| August | 20.6 °C | 0.2 mm | 100% | 0.29 |
| September | 19.9 °C | 0.9 mm | 84% | 0.34 |
| October | 17.9 °C | 2.7 mm | 79% | 0.21 |
| November | 14.4 °C | 3.1 mm | 56% | 0.16 |
| December | 12.1 °C | 2.1 mm | 52% | 0.16 |
"How busy" is that month's overnight stays as a share of the busiest month. 100% is the busiest month itself.
How busy it gets
The busiest month is August, with about 86,812 overnight stays in registered tourist lodging. The quietest is January, with about 35,929. Both are averages of 2023-2025, from INE, Statistics Portugal.
June is a little quieter than the peak: 78% of August.
How the score works
- Warmth. A mean temperature between 17 and 24 °C scores best. The score falls to zero at 8 °C and at 30 °C.
- Dryness. The more rain a day, the lower the score. 5 mm a day or more scores zero.
- Crowds. A full month loses up to 70% of its score. A month half as busy as the peak loses 35%.
We use the mean temperature, not the daily high. A "hottest day" number makes summer look worse than it feels for most of the day. The full rule, and why we chose it, is on the method page.
Not in the score: sea temperature, festivals, prices and daylight hours. We have no sourced value for them yet.
Other cities
Going in March? Portugal in March, all 10 cities ranked compares Sintra with the others for that month, with highs, lows and the Easter effect.
| City | Best month | Mean temp then |
|---|---|---|
| Porto | July | 19.9 °C |
| Faro | June | 21.4 °C |
| Lagos | June | 19.9 °C |
| Coimbra | June | 19.4 °C |
| Braga | June | 18.3 °C |
| Evora | June | 22.5 °C |
| Cascais | June | 18.9 °C |
| Funchal | January | 16.6 °C |
| Aveiro | June | 19.1 °C |
How we made this page
Built on 2026-09-30 by our script from two open sources. Temperature and rain are long-term monthly averages for one point in Sintra. Visitor numbers are the monthly average of 2023-2025.
Research and first drafts are AI-assisted. Every figure comes from open data listed on the page with its source and date, and a person reviews each page before it goes live.
- NASA POWER, monthly climatologyNASA POWER data use policy (open, attribution required). Fetched .
- INE, Statistics Portugal, overnight stays (indicator 0010735)CC BY 4.0. Fetched .