I visited Oia, Santorini for 5 days in 2017, June month. The temperature during the day was around 18-20 degrees.
I stayed at northwest edge of Santorini island within the Cyclades. The place is so beautiful that anyone can walk and enjoy the view entire day from different points of the caldera.
The houses were white and blue colors, restaurants were accessible and food was really good. I enjoyed the greek salad, fried zucchini, tzatziki for dipping, and OUZO (must try) with blue waters of the Aegean Sea view.
Dinner at Sunset view.
Delicious falafel at Thira.