Sintra in September
In September, Sintra averages 24°C (75°F) during the day and 16°C (61°F) at night, with around 7 days of rain (55 mm total).
High seasonConditions are comfortable for sightseeing without being sweltering. Occasional showers are likely but won't dominate.
September is a great month to visit Sintra: pleasant temperatures and relatively few wet days.
How September compares to the rest of the year in Sintra
September is one of the warmest months in Sintra (3rd of 12) and moderately rainy compared to the rest of the year (9th of 12). Daytime temperature runs 4°C above the annual average (20°C). September runs 1°C cooler than August (25°C) and cools 3°C in October (21°C).
September sunrise & sunset in Sintra
Times shown for Sintra local time (Europe/Lisbon), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Sintra — September
Golden-hour and blue-hour windows for the 15th of September, in Sintra's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Sintra in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (High season) and Sintra's popularity.
Crowds & pricing — September in Sintra
This is a busy month in Sintra — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather
Sun & mosquito risk — September in Sintra
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sintra in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 15°C / 59°F | 8°C / 46°F | 140 mm | 12 | 0 |
| February | 16°C / 61°F | 9°C / 48°F | 115 mm | 11 | 0 |
| March | 18°C / 64°F | 10°C / 50°F | 90 mm | 11 | 0 |
| April | 18°C / 64°F | 11°C / 52°F | 90 mm | 11 | 0 |
| May | 20°C / 68°F | 13°C / 55°F | 75 mm | 10 | 0 |
| June | 23°C / 73°F | 15°C / 59°F | 30 mm | 5 | 0 |
| July | 25°C / 77°F | 17°C / 63°F | 5 mm | 1 | 0 |
| August | 25°C / 77°F | 17°C / 63°F | 5 mm | 1 | 0 |
| September | 24°C / 75°F | 16°C / 61°F | 55 mm | 7 | 0 |
| October | 21°C / 70°F | 14°C / 57°F | 140 mm | 11 | 0 |
| November | 17°C / 63°F | 11°C / 52°F | 155 mm | 12 | 0 |
| December | 15°C / 59°F | 9°C / 48°F | 170 mm | 12 | 0 |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Sintra in September →
Frequently asked questions
How hot is Sintra in September?
In September, Sintra averages a high of 24°C (75°F) and a low of 16°C (61°F) — generally warm.
Does it rain a lot in Sintra in September?
September sees occasional rain in Sintra, with about 7 rainy days on average.
Is September a good time to visit Sintra?
September is warm. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Sintra in September?
Pack light layers for warm days and cooler evenings. See the full September packing list for Sintra for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.