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Easter ("Semana Santa", the Holy Week) is probably the second most important holiday season in Spain. Coastal cities are usually full of national and foreign tourists which enjoy both the cultural traditions at the city and the progressively warmer weather at the beach, but thankfully not as packed or as hot as in summer.
This year Easter will be the last week of March. Obviously, the weather would be a bit more rainy than in summer... but this is Almeria we're talking about. You'll get some really nice and sunny "beach days" unless you're really unlucky.
For the record, here's historical climate data for Almeria. Average max temp is 18 C in March, almost 20 C in April. Average rainfall is 22 mm in March, 24 mm in April.
And also, a couple of links showing pictures of how Almeria beaches look like in Semana Santa.
Honestly, this might be one of the best moments you could choose to go there.