Best time of year to visit: Spain vs. Portugal
Portugal and Spain are similar in terms of the best time to visit. With mild temperatures, fair weather and fewer crowds, spring (March to May) and fall (September to November) are generally the best times to visit both Spain and Portugal.
During the summer high season (June to August), the weather will be at its hottest, and popular destinations like major cities (Lisbon in Portugal and Barcelona in Spain) will be more crowded. The region's many beautiful beaches, especially along the Mediterranean Coast in Portugal's Algarve region and Spain's Andalucia, Valencia, Murcia and Catalonia regions, will also be busier.
Even winter is a good time to visit both Spain and Portugal, as the winter season on the Iberian Peninsula is mild. Temperatures are usually in the 50s, with some rain and storms. But in general, it's still a pleasant time to travel. Rates will also usually be at their lowest for the tourism low season.