Temperature at outlet for non-isothermal laminar flow in circular tube

I am examining a non-isothermal laminar flow in circular tube in COMSOL where the heat transfer fluid in the tube is heated as is passes the tube. Since the flow is laminar a velocity profile will form. This will impact the outlet temperature since the average temperature at the outlet won't be the actual outlet temperature, i.e. the heat transfer fluid in the middle will have twice the velocity of the average and hence the fluid with this temperature will exit in a greater extent.

How can I take the velocity profile and circular cross-section into account and get the "actual" outlet temperature?

Thank you!