April to May and September to October are the best times for perfect weather. In central Spain and on the Mediterranean coast, the spring and autumn seasons are marked by sunlit days and pleasant weather perfect for strolling and outdoor dining in terrazas, with temperatures cooling down by nightfall.

May is widely considered the "Goldilocks" month to visit Spain in 2026. The weather is spectacular, with average highs ranging from 20°C to 25°C (68°F–77°F) across much of the country. This allows you to explore the cities like Madrid and Seville before the "brutal" summer heatwaves—which can top 40°C in July—begin to arrive. It is also the perfect time for the Festival of San Isidro in Madrid or the famous Patios Festival in Córdoba. Since it is still the shoulder season, you can often find lower airfares and better hotel availability than in the summer. The beaches on the Costa del Sol and the Balearic Islands are sunny and pleasant, though the water may still be a bit "brisk" for some swimmers. Overall, May offers the best balance of vibrant local culture, manageable crowds, and comfortable "walking weather" for visiting the Alhambra or the Sagrada Família.