Aluminum sections are extruded from billets heated to 800-925F under high pressure and then pushed through a die.
During the entire process temperature is carefully controlled, because depending on the aluminum alloy and performance expected heat stages at the beginning and exit out of die are crucial.
here is the diagram of the extrusion machine.
If it is not in the solution annealed condition , aging ( I guess that is what you mean by tempering) will do about nothing. If is in "as rolled" condition it may have cooled quickly enough to be partly solution annealed; then it may harden slightly during aging.