Climate Chart of Sintra, Portugal

Climate overview

Temperature

Monthly mean temperatures are at their lowest in January, at 11.0 °C, and reach their highest in August, at 20.3 °C. These figures describe averages for each month, not daytime maximum temperatures, so they provide a guide to the overall temperature level rather than the full range visitors may experience during a day. The unweighted mean of the monthly temperature means is 15.5 °C. It summarizes the calendar-month averages, rather than a day-weighted annual average, and should not be read as a forecast for any particular date.

Rain

Mean daily rainfall is highest in November, at 3.10 mm/day, and lowest in August, at 0.10 mm/day. The lower average in the latter month can help identify an option for visitors prioritising less average daily rainfall, while the higher figure points to a time when rain preparation is especially relevant; neither average describes how often rain falls or guarantees conditions on a particular day. Across the calendar-month means, the unweighted mean daily rainfall is 1.84 mm/day. This is an average daily amount, not a monthly total, and it cannot by itself indicate the frequency or timing of rainy spells.

Sunshine

Mean daily sunshine reaches its highest level in July, at 12.69 hours/day, and its lowest in December, at 6.76 hours/day. These averages can help with planning outdoor time around brighter or less sunny periods, but sunshine duration is not the same as day length and does not guarantee clear skies on an individual day. The unweighted mean across the monthly sunshine averages is 9.67 hours/day per day. It is a calendar-month summary, not a promise of the sunshine available on a specific visit date.