June to September: why august heat is an inspector's friend
Peak summer is unpleasant for everyone involved, and it is also the most honest test environment the UAE offers. At 45 degrees and above, there is nowhere for a weak component to hide. The AC either holds cabin temperature in slow traffic or it does not. A transmission with degraded fluid will hunt and flare on a hot test drive in a way it never does in December. Cooling fans, viscous couplings, auxiliary electric fans and radiator cores are all working at their design limit, so an inspector gets a free stress test simply by turning up.
One summer-specific warning: do not let a seller hand you a car that has been pre-cooled and idling for half an hour before you arrive. Part of the value of a hot-weather inspection is the hot start and the heat-soak behaviour, meaning how the engine restarts and idles after sitting switched off for ten minutes in the sun. Fuel-system and ignition faults that vanish on a cold engine show up exactly there, and a seasoned inspector will deliberately build that pause into the visit.