Spring in Barcelona is mild and pleasant, with temperatures ranging from 15°C to 22°C. The weather is mostly sunny with little rain, making it perfect for walking around the city and enjoying outdoor cafés. Crowds are moderate, increasing slightly in May and prices for hotels and attractions are more affordable than in summer. Major events include Semana Santa with religious processions, the Feria de Abril featuring flamenco and traditional music.

Summer is hot and sunny, with temperatures between 25°C and 32°C. Humidity rises, and short rain showers can occur, but it is ideal for beach activities. This is peak tourist season, so attractions and beaches are crowded and prices are at their highest. Key events include the Festa Major de Gràcia in August, the Sónar electronic music festival in June and vibrant nightlife along the beaches.

Autumn brings pleasant and cooler weather, with temperatures from 18°C–26°C in September dropping to 12°C–20°C by November. Rain becomes more frequent, but there are still many sunny days. Tourist crowds decrease after August, making sightseeing more enjoyable and hotels more affordable. Notable events include La Mercè Festival in late September, featuring fireworks, human towers and parades, as well as the Barcelona International Jazz Festival in October and November.

Winters are mild, with temperatures ranging from 8°C to 15°C. Rain occasionally occurs, but snow is rare, and cooler evenings are ideal for museums, tapas bars and indoor activities. This is the low season, so there are fewer tourists and lower prices for hotels and flights, except around Christmas and New Year. Major events include Christmas markets and lights around Plaça Catalunya, the Three Kings Parade on January 5th and gourmet food and wine festivals.