Sintra's weather is mild and temperate, with significant seasonal variations. Winters are cool and wet, with temperatures ranging from just below freezing in January and December to around 10°C on average. As spring arrives, temperatures gradually warm up, reaching an average high of 16°C by April and May. Summer brings warmth, with July and August averaging highs above 30°C, but the heat is tempered by gentle breezes and sea fogs. Autumn returns to cooler temperatures, with a similar pattern to winter, before the cycle repeats itself in the following year.