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Are sleeping bags needed in Spain in summer?

My girlfriend and I are going camping in Europe this summer and are starting off in Spain. We have this tent, and are looking into sleeping bags. We have also been keeping an eye on the weather in Spain at night time and are wondering whether a sleeping bag is actually needed? We don't really want to spend a load of money on a sleeping bag if we're just going to melt in them.

Maybe we just don't know enough about the right sleeping bags? We were thinking maybe just getting sleeping mats and a small blanket.

Has anyone got any experience that could help us decide what to do?