Yes, we have also been in Arillas in October and have had rain, storms and lovely sunshine, all in equal measure, but managed the beach most days, of course the evenings are darker earlier and cool, but you just eat inside if necessary (which I quite like). We did start booking earlier to be more sure of more sun, but then, if there wasn't the rain Corfu would not be so green, lush and attractive. Whatever the weather the warmth and friendliness of the lovely people of Arillas is no different whenever you visit.