Click on a day for an hourly weather forecast
The temperatures in Sintra in September are comfortable with low of 18°C and and high up to 25°C.
You can expect a few rainy days in Sintra during September, but usually the weather is comfortable in September.
Our weather forecast can give you a great sense of what weather to expect in Sintra in September 2025.
If you’re planning to visit Sintra in the near future, we highly recommend that you review the 14 day weather forecast for Sintra before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 10° | 5 | 26 | 0 | 89 mm | Good | Sintra in January |
| February | 15° / 10° | 5 | 24 | 0 | 89 mm | Good | Sintra in February |
| March | 17° / 11° | 6 | 25 | 0 | 97 mm | Good | Sintra in March |
| April | 18° / 12° | 5 | 25 | 0 | 89 mm | Good | Sintra in April |
| May | 21° / 15° | 3 | 28 | 0 | 60 mm | Good | Sintra in May |
| June | 23° / 17° | 1 | 29 | 0 | 20 mm | Perfect | Sintra in June |
| July | 25° / 18° | 0 | 31 | 0 | 5 mm | Perfect | Sintra in July |
| August | 25° / 18° | 0 | 31 | 0 | 7 mm | Perfect | Sintra in August |
| September | 25° / 18° | 2 | 28 | 0 | 49 mm | Perfect | Sintra in September |
| October | 22° / 17° | 4 | 27 | 0 | 109 mm | Good | Sintra in October |
| November | 18° / 14° | 6 | 24 | 0 | 131 mm | Good | Sintra in November |
| December | 16° / 11° | 5 | 26 | 0 | 113 mm | Good | Sintra in December |