Could be, but could also be an issue with the blender flaps. It's worth first trying a calibration. Press the Auto and recirc buttons simultaneously. you'll hear a beep an message confirming calibration on the SID. You could also try putting your hand on the pipes to/from the evaporator. One should be hot, the other very cold.
If you have access to Tech2 you can read the refrigerant pressure. The minimum system pressure is around 2 bar. On a warm day with the A/C working hard, you would expect that to be up around 13-15 bar.