Weather in Sintra by month: what to expect when visiting

Синтра enjoys a mild coastal climate, with gentle seasonal shifts that make it a year-round destination. Winters here are cool but rarely harsh, while summers stay warm without the extreme heat found in Portugal’s inland regions. The ocean moderates temperatures, keeping Синтра comfortable even in July and August, when daytime highs reach 24–26 °C.

Rainfall in Синтра follows a clear pattern: the wettest months are January, March, and October–November, when showers are more frequent. From May to September, dry weather dominates, with July and August seeing almost no rain at all. This makes late spring and early autumn ideal for exploring Синтра’s palaces and gardens without weather disruptions.

Temperatures in Синтра rarely stray into extremes. In January, the coolest month, averages hover around 11.6 °C, with nights dipping to 8.9 °C. By April, warmth builds steadily, and May brings pleasant days around 20.5 °C. The peak of summer, July and August, sees highs of 24.6–26.1 °C, though evenings remain mild at 16–17 °C.

Autumn arrives gradually, with September still warm at 23.8 °C, while October cools to 22.3 °C. Even in December, Синтра avoids freezing temperatures, with averages around 11.1 °C. The narrow range between winter lows and summer highs makes layering easy, whether you’re visiting in February or June.

Rain in Синтра is most persistent in January and March, with monthly totals of 165 mm and 168 mm respectively. These months often bring overcast skies and occasional downpours, though showers rarely last all day. By contrast, July and August are almost rain-free, with just 2–7 mm of precipitation, offering reliable dry weather for outdoor plans.

October marks the return of wetter conditions, with 123 mm of rain, while November sees similar levels. The transition months—April and September—strike a balance, with modest rainfall (66 mm and 32 mm) and plenty of sunshine. If you prefer drier visits, aim for May through September, when rain is the exception rather than the rule.

For a trip to Синтра in winter, pack layers to handle cool mornings and mild afternoons. A waterproof jacket is essential for January or November, when rain is common, while a light sweater will suffice for evenings. Comfortable walking shoes are a must year-round, especially if you plan to explore the town’s steep hills.

In summer, lightweight clothing works best, but don’t forget a light scarf or shawl for breezy evenings. June through August calls for sun protection—hats, sunglasses, and sunscreen—though the ocean breeze keeps the heat from feeling oppressive. For spring or autumn, a mix of short- and long-sleeve options will cover the shifting temperatures, with a compact umbrella handy for unexpected showers.