AZW, everyone is different with regard to what temps can be tolerated in what protective suit. If you believe yourself to be fine in a skin, you'll probably be fine in a skin. I always wear a full 3 mm, no matter the water temp, especially when doing multiple days of diving.

Sometimes when temps dip to under 79F, I have to wear a head covering too.

A fish and a bird can fall in love, but where will they build their nest?