whether the weather be hot

I have some serious packing to do. One suitcase is going to a snowy place and will be full of ski stuff. One suitcase is going to an icey place and will be full of warm layers and waterproofs. And one bag is going to sunny Spain....which WAS sunny but may not be when we arrive. I've been casually glancing at the iPhone weather app every 10 minutes for the last 3 weeks and it's been sunny and hot. But next week the phone says ....rain. RAIN? In Spain! WTF?