The flies are fecking awful. But they keep you moving forward lol.
Too right, the March flies, they are bastards, they kick in just after nullarbor rh, where I guess you are now. You'll be rid of them by Penang but they are horrible. Bites can get infected too so keep swatting them off
Not necessarily the heat but the wind or the flies or whatever is out there. I dunno, I'm not silly enough to fly over there to find out... this year.