Sintra weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May – September
What is the weather like in Sintra in September?
In September, Sintra is warm: daytime highs average 23 °C, and nights cool down to about 17 °C. The sun shines for around 8 hours a day. Rain is rare: about 4 days bring 31 mm in total. All in all, September is an excellent month for a holiday in Sintra.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 100 | 96 | 80 |
| Day | 24° | 23° | 20° |
| Night | 18° | 17° | 15° |
| Sun | 10 h | 8 h | 6 h |
| Rain days | 1 | 4 | 9 |
More details for September
- Daylight
- 12 h 30 min07:18 – 19:48
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 36 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+1Europe/Lisbon
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %87 %
- Few rainy daysweight 30 %97 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
Sintra in September: quick answers
Is Sintra hot in September?
Warm rather than hot: in September, daytime highs in Sintra average 23 °C and nights cool to about 17 °C.
Does it rain much in Sintra in September?
Rain is rare: about 4 days bring 31 mm in total.
Sintra month by month
The whole year in SintraAll destinations: PortugalWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences