"Typical" temperature of resistor at its rated power
You can get some idea of the expected maximum temperature if the manufacturer specifies the temperature at which allowable dissipation drops to zero. 

For example, from a Yageo datasheet (two different models): 



As you can see, either temperature is quite sufficient to sear human flesh. Usually its better to not operate such components near the limits of their allowable range. At temperatures much about 100°C life can be affected and it can result in PCBs and nearby parts deteriorating at an undesirably accelerated rate. 

(If it isn't obvious, you would expect the temperature of the MRA632 to be 155°C at maximum power and 70°C ambient, and at (say) 40°C ambient to be more like 125°C).