Cascais enjoys a very favourable maritime weather. Summers are warm and dry and last from May to September. On an average, July tends to be the hottest month with an average maximum temperature of 28ºC and an average minimum of 17ºC. Winters are mild and January is the coolest month in Cascais with temperatures ranging from 8ºC to 15ºC. It is advisable to plan your trip around April-May.