I spent 26 Aug - 2 Sep in Neelum Valley. Weather was pinching hot in day time and nights were normal in valley. Only cold was experienced during camping sites of Ratti Gali and Chitta Katha which are at higher altitudes. Taobutt night was not that cold but was very damp.
You can use blanket except if u camp at lakes. Temperature at lakes is usually low because of being above 12000 ft so body heat isolation won't work with blankets.
It can rain anytime so no compromise on camps ... they have to be water proof so buy good stuff !!!