Too many folks wearing wetsuits (in 82-84 degree water?)
Great question!
No doubt 82° F water is generally considered "warm" by most water sports enthusiasts. But 82° is still 16° cooler than our body core temperature and water, due to its density, is well-known for its highly efficient thermal conductivity characteristics.
While experiencing debilitating hypothermia isn't likely to occur during typical warm-water dive times, the colder sea water does inevitably slowly sap body core temperature from uninsulated or under-insulated divers, resulting in higher energy expenditure, increased air consumption, and shorter bottom times etc.
When we first started diving Bonaire back in the 90s, I wore a 3mm shorty wetsuit and enjoyed ~50 minute dives. Nowadays I wear a 5mm full suit and a 2mm beanie and easily enjoy ~90 minute dives on similar profiles.
My wife dives with a similar 5mm full wetsuit + beanie setup and has an enviable SAC rate compared to me. With Bonaire's easy lazy shore dive profiles she could probably dive 120 minutes on an aluminum 80 cu ft nitrox tank, but she starts feeling cold at around 80 minutes and starts nudging me towards shore.
We still see plenty of folks diving in swim trunks or shorty wetsuits on Bonaire, but none exhibiting admirable air consumption or enjoying extended bottom times. (A notably predictable exception was Murph Henar, a well-known and longtime Surinamese DM at Buddy Dive—and our good friend—who passed unexpectedly in 2019 due to health issues.)
I don't mean to humble brag about our particular scuba skills or bottom times etc., because we're really nothing special that way, lol. My point is just that the basic physics and human physiology of scuba diving explain why
too so many folks wear wetsuits in 82° water.
Thanks for attending my two-beer scuba TED talk.


