Portimao's winters are mild, with temperatures ranging from 1-19°C in January and 6-20°C in February, gradually warming up towards spring. As March and April approach, temperatures rise further, averaging around 17°C, with occasional highs of up to 23°C. Summer months bring warmer days, peaking at 40°C in August, but also some cooler nights, while autumn is characterized by gentle temperature fluctuations between 11-29°C. Autumn and spring seasons are relatively similar in terms of temperature range, with winter being the coolest period.