Visiting local bars in Lisbon is more fun when you know what the weather holds. These rainfall averages and temperatures can help you choose the best time for bar hopping. The hottest months are usually July and August with an average temp of 68°F, while the coldest months are January and February with an average of 18°F. The snowiest months in Lisbon are April, March, December, and February, with each month seeing an average of 10 inches of snowfall.