Girona area, end Sept - pool heating?

[Leadfoot]

Going to rent a villa in the Girona area of Spain (Calonge probably), end of Sept for 10 days & was wondering whether pool heating is a must have?

I think daytime temps should be mid 20s, but nights might be a bit cooler so an unheated pool might be a bit bracing in the mornings?

Any experiences PH?

[Leadfoot]

Ta, sounds like heating is a must then.