i went for last 2 weeks in september in 2006, the first week was brilliant but 2nd
week we had a lot of cloud and showers but when the showers stopped it dryed up very
quickly as it was still very warm and you would never of known we had rain.
I have been to Lanzarote also (but was Feb) and also had some showers then but really it
just depends on your luck, but i personally would prefer Zante much nicer place and beaches.