Lisbon in general experiences a usually mild climate. You are sure to witness regular sunshine and the snowfall is quite rare. The hottest month of Lisbon weather is August, with an average of 28 degree Celsius. The evenings are balmy and mild, causing people to congregate in the main squares and pavements. In general Lisbon experiences very less rainfall and two main seasons which are summer and winter.
Although weather in Lisbon is pleasant all around the year, the summer months of June, July and August are the best time to visit Lisbon to take full advantage of the coast.