January and February are traditionally perhaps the coolest months, although often January is warm enough to still enjoy the beaches. The evenings can go quite cool, and certainly Lagos (known locally as "the windy city") can have a very nippy breeze at times, particularly crossing over the marina bridge! By now the spring flowers are in full bloom, with new ones opening every day making the cliffs at Ponta da Piedade in Lagos, for example, a mass of colour. Obviously there are occasional rainy days and a few cloudy days but most days are blue skies and sunny and the temperatures are very pleasant (maybe 16°-18°C in the shade, but feeling in the mid 20's in the sun). A light sweatshirt or jumper is normally all that you will need during the day and a warmer jacket for evenings.