Due to the beautiful weather and fewer tourists, the ideal times to travel to Spain are in the late spring (April to May) or early autumn (September to October). Nonetheless, you may find something to enjoy at any time of year because of the nation's numerous attractions like the Casa Batllo Tickets all year around.

The weather in Spain is often pleasant and dry all year round. Summers may be fairly warm, especially in the south, and more European tourists are seen traveling to the well-known beach resorts. If you are concerned about the heat during the summer, the north is a fantastic alternative because of the lower temperatures.

Seldom do winter lows fall below 10°C. The north can get chilly and rainy, while the south is still nice.

Going to Spain between January and February

Although the majority of companies are still open, the beginning of the year may be somewhat quiet in Spain with fewer people and less activity. The month of January in particular is referred to as the "rebajas" season since most retailers provide fantastic prices on their merchandise following Christmas. Make sure to book Casa Batllo Tickets in advance.

Traveling to Spain in March–April

While they aren't as packed as in the summer, Spain's streets start to bustle with more activity as the weather warms up. Throughout Semana Santa or Holy Week, a lot of people go outside to see the parades that go through the streets. It's a really good time to come because of the warmer but not oppressively hot weather.

Traveling to Spain in May-Aug

The nation blooms with colorful flowers and inhabitants start spending more time outside in the sunshine, temperatures continue to increase. The month of Maya and the following months is ideal for outdoor pursuits like trekking or visiting beaches before the crowds arrive. The weather is often warm and hasn't yet gotten to the unbearable heights of hot summer.

Going to Spain between September and October

After the summer bustle and throngs, Spain starts to calm down. The nation is in a more tranquil condition, while it is still alive with daily Spanish life as the temperatures return to more agreeable levels and the majority of tourists have returned home. This is a suggested period for seeing the nation to take advantage of the nice weather and fewer tourists.

Traveling to Spain between November and December

When winter draws near, Spain gets chilly once more, but there is still a lot to enjoy. Several large cities host jazz festivals in November, while Spain's streets are decked out for Christmas in December.

Ref: https://www.rolonet.com/blogs/178563/When-to-Go-to-Spain-Best-Time-to-Visit-Spain