Winters in Caldas da Rainha are mild, with temperatures rarely dropping below freezing and averaging around 10°C in January. Spring brings gradual warming, with March and April temperatures rising steadily towards the mid-20s Celsius. Summers are warm to hot, with July and August often seeing highs above 35°C, but average temperatures still hover around 21°C. Autumn is a slight cool-down from summer's warmth, with September and October averaging around 19°C, while winters bring temperatures back down to around 10-14°C. Overall, the region enjoys a relatively mild climate year-round, with moderate temperature fluctuations between seasons.