Looks like low air temps in the morning are around 54f over there. I'd be on a full suit too.
Also, when your average water temps are around 60, maybe 72 feels quite warm. Not so when your average water temps hover around 80f. 72 actually feels a bit chilli when you first get in (not too bad of course).
I remember my first session back in Brazil after I was in LA for 6 months. water never got warmer that year in SoCal, it was still around 61f in June.
My first session in Brazil was in the middle of the winter here, overcast day, air temps around 64 (which is pretty cold for Guarujá)... water was around 68f... It felt like a fucking bathtub, I was trunking it while all my buddies were in full suits.
I was myself again after a couple of weeks though.
Water temps here are now around 72 too... with air temps around 65, I'm usually on my springsuit, always wondering if I should put on the full suit.
Water just never gets below 60 here... that's a whole different beast. numb feet, numb fingers. nope, scratch that... it's so cold it's not even numb, it actually hurts.