Last year mid-September weather was very warm across the Iberian Peninsula: 42C in Sevilla and interior Andalucia, 39C in Madrid. We were able to swim at beaches in Cantabria (north central Spain). Unless you plan to go to the mountains (Pyrenees), your summer wardrobe should still be appropriate for the Costa del Sol (Torremolinos - IMHO) and for Sevilla and Granada.
[ 09-03-2001: Message edited by: Eddie ]