September to November: short wetsuit, air 27°C. December to April: shorts and a lycra (as sun protection), air more than 33°C. April to May: shorty again, air 22°C. May to August: long wetsuit (3.2 mm), air 22°C. When the winds are from the Northeast, the water is cold, requiring a thicker wetsuit, minimum 3.2.
Best directions are Northeast and South. Best time of the year during spring. During summer stronger fronts coming from South. During autumn lighter winds from N and NE. During winter you will find the worst wind. In average you can estimate 3-4 days with wind over the year.
From Florianopolis drive east to Lagoa and from here further to Barra da Lagoa. The beach stretches all the way from Barra da Lagoa to Sao Joao do Rio Vermelho. Lots of accesses.