Don't you have any windchill overthere on your latitude???
I remember sailing days in the south of France with airtemperatures above 30 Celcius and people could still suffer hypothermia.
Because the cold sea water on their skin was evaporated by a hot land-wind in a flash.
Taking all their body-warmth away.
The water temperature and air temperature are very close in all seasons except winter/early spring (where water temperature is above air temperature)
Example: Today Air =32C, water = 28C
