When is the best season for Turkey?
The best time to visit Turkey is April to October that is when the weather is at its best. In the middle of May to the end of September it is high season and decidedly the best time to visit.

During May to September it is at its warmest and when the weather more often than not, consists of clear blue sky and sun. July and August are even warmer. Temperatures can rise up to 40-45 degrees in the shade. It sounds worse than it is, as humidity is so high, at times almost 80 percent, which makes it feel as if it is warmer than it actually is.
Read more about the climate in Turkey

Below is what the average temperature is normally like in Turkey during a whole year:

The average temperature in Turkey:

In Celcius

Month	Jan.	Feb.	March	April	May	June	July	Aug.	Sept.	Oct.	Nov.	Dec.
Temperature in Celsius (pm.)	10	15	17	20	24	30	35	38	30	26	19	15
Night temp.	6	6	11	12	16	20	25	25	19	15	11	8

In Fahrenheight

Month	Jan.	Feb.	March	April	May	June	July	Aug.	Sept.	Oct.	Nov.	Dec.
Temperature in Fahrenheit (pm.)	50	59	63	68	75	86	95	100	86	78	66	59
Night temp.	42	42	51	53	60	68	77	77	66	55	52	46

Rainfall in Turkey

It often rains in the winter and this is the average rainfall in Turkey:

Month:	Jan.	Feb.	March	April	May	June	July	Aug.	Sept.	Oct.	Nov.	Dec.
Rainfall in mm.	238	191	102	48	28	9	5	2	13	70	150	223

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Learn more about the climate in Turkey here