A bit wrong timing for that area.
Mt.Nemrut has 2 entrances, north from malatya, south from adıyaman.
Take the south entrance as it is a natural park area and north one is under construction.So you will make it to adıyaman first.
Three roads available all in good conditions but sometimes partly under small constructions.
North to south.The more north is the more natural one but the more south is the less cold one..
1-Göreme-malatya-adıyaman....570 km.
2-göreme-kahramanmaraş-adıyaman...510 km. km.
3-göreme-adana-adıyaman....935 km.
From adıyaman to kahta...34 km. asphalt.
from kahta to the top of Mt.Nemrut.. 43 km.
day and night 2 different climates now..more than 20 minutes walking at the top is not recommended for those who are used to smoking or have heart problems..
after watching the sunset on the west terrace, highly recommend spend the night there and watch the sunrise on the east terrace..When it is dark, you can put up your tent.Completely safe and every night several people spend the night at the top.
Also can recommend you my Spanish friend's blog for more tips who made it last year.In new zealand now after a great asia trip..
https://www.facebook.com/jose.m.garc...ref=ts&fref=ts
https://www.facebook.com/AventurasEnMoto
Aventuras en moto | Viajando por el mundo en moto
All the best..