What would be guaranteed to comfortably swim and sunbathe in Turkey on your dates I can not recommend any sea resort. It's warm, but the sea is very invigorating. But I will say that the vagaries of the weather are unpredictable.

Guarantee of swimming on April 25 in Turkey only the thermal springs of Yalova and others, as well as heated pools.

A detailed forecast for the coming days at popular resorts can be found on page «Weather in Turkey».