You’re lucky if you are going on holidays this Easter weekend because weather will be not so bad (meaning that it is not going to rain a lot). In order you do not delay 10 minutes to make your suitcase, I will recommend you different outfits for each day:
Add an umbrella if you visit the Canary Islands and the Basque Country.
Bring a folding umbrella into your bag to use it in the afternoon in Galicia.
On Saturday it will rain in Galicia, Castilla y Leon, Asturias and Extremadura so add an umbrella to the outfit.
It will rain in Spain except in the Canary Islands, Balearic Islands, Valencia, Murcia and eastern Andalusia. In these areas you will not need an umbrella.