What is the weather forecast like for Spain?
You need to be a bit more specific! There are many parts of Spain, and the weather can vary greatly! Knowing the NORMAL weather, I would say, bring layers…a sweater or sweatshirt or light jacket to go over a light shirt for places like Madrid in the mornings. It warms up in the daytime (usually). What would YOU describe as “unseasonably warm”? Since, you know, normal in Sevilla, mid day…would be nearly 40 C this time of year. That would fit my description of “seasonably warm” and it is HOT!