From Ann, here's her absolute guarantee of temperatures for the trip:

By the way, the temperature while we are there will most likely be given in Celsius.  The formula to convert is (9/5)C +32 = F.  Most people don’t like fractions, unlike your math professor tour guide, so you can just double the Celsius temperature and add 30.  It will be close approximation.

Istanbul        54-74

Bursa           52-75
    
     
Canakkale   56-75

Kusadasi     59-79

Patmos        60-80

Crete           61-76
  

Santorini      62-72

Athens        63-83

via bob