GreenlyLast and first frost dates in Sintra
Portugal
Sintra had no frost in 2016–2025, so crops are planted by warmth and rain rather than by frost dates.
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| Last spring frost | none in ten years |
|---|---|
| First autumn frost | none in ten years |
Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.
There is no frost season here: crops are planted by warmth and rain rather than by frost dates.
When the soil warms up in Sintra
The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo).
| Soil | Date |
|---|---|
| 5 °C | already in the first week of January |
| 10 °C | already in the first week of January |
| 15 °C | 14 March |
| 18 °C | 25 April |
Frost dates near Sintra
Of the nearest cities on our list, the last spring frost ends earliest in Évora (12 January) and latest in Leiria (22 January).
Sintra: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Weather in Sintra by month
Average weather in Sintra over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: June–October (20.5–22.5 °C). No month averages below 0 °C at night; the coldest nights, in January, average 10.1 °C. About 734 mm of rain falls in a year, on 103 days; November is the wettest month (108 mm) and August the driest (4 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days |
|---|---|---|---|---|
| January | 14.6 | 10.1 | 86 | 11 |
| February | 15.3 | 10.5 | 66 | 9 |
| March | 15.8 | 11.1 | 102 | 12 |
| April | 17.1 | 12.5 | 78 | 12 |
| May | 19 | 14.4 | 46 | 8 |
| June | 20.5 | 16.1 | 28 | 7 |
| July | 22 | 17.2 | 9 | 3 |
| August | 22.5 | 17.5 | 4 | 2 |
| September | 22 | 17 | 28 | 5 |
| October | 20.6 | 15.8 | 81 | 10 |
| November | 17.2 | 13 | 108 | 12 |
| December | 15.5 | 11.2 | 98 | 12 |
Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).
