Lisbon is one of the few European cities which shows of a warm weather during the whole year. During the winter months, temperatures use to go down,but not more of 5ºC, and in the Summer temperatures go up easily to the 30ºC. Lisbon is a quiet rainy city, specially during the Autumn and the Winter, when there is also a lot of wind from the Atlantic. During the Spring and the Summer days, in general, it is very sunny and there are less possibilities of rain.
3 days. Lisbon is a city which has many hidden treasures in its streets, and it is very recommended to not visit it with hurries, so at least, to spend 2 or 3 days. During the third day, it is recommended to visit a bit the surroundings like the villages of Sintra and Cascais, located about 1 hour by train from Lisbon, so perfect for a day-trip.