Concerning the weather in all of Europe's most wonderful travel destinations, Lisbon's climate is among the mildest. Snowfall here is exceedingly rare, and the city's subtropical-Mediterranean climate keeps temperatures very tolerable throughout the year.
Of all Europe's metropolises, the city of Lisbon boasts the warmest average daytime temperatures, the most comfortable nighttime temperatures, and the mildest winters, making almost any time of year the best time to visit Portugal.
The summer season is Lisbon's busiest. Temperatures from June through August are generally in the 70s, dipping into the 60s at night. It is during these months that you?ll have to make reservations for popular restaurants, and accommodations far in advance, and you should expect Portugal's already crowded capital city to be even more lively than usual. If a trip to the beach is on your agenda, this is the time to go.
During the spring, the weather rarely dips below 60, and sometimes warms up to the lower 70s. That's almost trip-to-the-beach weather. True, you'll run a higher risk of getting rained on while you?re seeing the sights (about ten times higher), but with monthly rainfall averages of 1-3 inches from March to May, it's really nothing to worry about. Plus, you'll dodge the lines and crowds normally associated with tourist season.
Fall in Lisbon is similarly attractive. Like springtime, the weather is still quite nice, with temperatures in the mid-to-high 70s during the day. All the sights and attractions are still open, but most of the summer lines have dissipated. And if you get caught in a rainstorm, you can always use it as an excuse to take refuge in one of Lisbon's many hearty and adventurous eateries. It sure beats standing in cue.
In Lisbon, even the winters aren't half bad. Temperatures usually reach the mid-50s? not exactly swimsuit weather, but you probably won't need a down parka, either. Yes, it's rainy, especially from November to February, but traffic isn't nearly as bad, so you can travel by car or metro, rather than let the wet weather get in the way of enjoying your trip.
So there you have it. Lisbon's summers definitely earn their popularity, but Portugal's capital city is certainly worth a visit during fall, spring, and winter. You'll want to bring a jacket, but you'll probably save plenty of money on accommodations, and you'll avoid the throngs of tourists who visit during the warmer months. Plus, you'll be able to catch Lisbon events aimed mainly at the locals, so your visit will make you feel like you're experiencing the real Lisbon, and mingling with the city's inhabitants.