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Sintra Weather in September
September in Sintra sees daytime temperatures around 23°C (73°F) and lows of 18°C (64°F) at night. The excellent weather makes it a good time to visit.
Rainfall in Sintra in September
You can typically expect 6 days of rain this month, averaging around 32 mm (1.3 in). The occasional light shower is possible, but rain is rarely an issue this month.
Temperature in Sintra in September
Sintra in September is worth a visit. The temperature is excellent, with 23°C (73°F) during the day and 18°C (64°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 18°C (64°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Sintra in September
Expect sunny days throughout the month, with an estimated 278 hours of sunshine. This makes it a pleasant time to visit Sintra.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Sintra Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
23°C (73°F)
Chance of Rain
21%
Precipitation
32 mm (1.3 in)
Rainy days
6 days
Humidity
75% *
Sunshine
278 hours *
Percentage Sunshine
75% *
* Data from: Cascais, Portugal (11 KM, 7 Miles).
Sintra Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sintra - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sintra typically stay consistent throughout September, with daily highs averaging around 23°C (73°F). Nights are pleasant, with lows typically ranging from 15°C (59°F) to 18°C (64°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Sintra in September
Browse day-by-day weather records for Sintra spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sintra historical weather extremes in September
Based on 50 years of weather observations in Sintra between 1976 and 2026, these are the recorded extremes.
- On September 4, 2006, temperatures climbed to 38°C (100°F), marking the warmest September day on record.
- The coldest September day was on September 26, 1992, with a maximum of 18°C (64°F).
- The lowest overnight temperature recorded in September was 8°C (46°F) (September 27, 2007).
Best Places in Portugal in September
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Sintra in September
For Sintra in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Some rain is possible, so pack something to handle light showers. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Sintra in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Barbeque9/10 -
Camping10/10 -
Outdoor sports10/10
Sintra 3-Day Forecast
More climate data for Sintra
Temperature Rainfall Sunshine Humidity
See the full Sintra climate overview or explore weather in Portugal.
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