The tables bellow  calculates an "average" temperature rise for the rotors under a single-stop event

The default values  are typical for an average  'sedan-type' vehicle.

 Brake Rotor Temperature Calculator ( lb, mph, F ) 

Car Weight (lb):                       
Rotor weight (lb - [all 4 rotors]): 

Initial vehicle speed (mph):  
Slowdown speed (mph):     

Average rotor temperature increase (F):

Peak rotor temperatures can be at least twice as high as what is calculated . 
Higher rates of deceleration will increase the peak rotor temperature more since the braking system has less time to dissipate the heat generated.
Under multiple decelerations, the temperatures move progressively higher because the rotors do not have a chance to cool to ambient temperatures.