I was in Floripa last year from Nov till end of Jan, the wind is 50/50 from North or from South, the North is always better its more clean and less huminity...as well as its from the left (im goofy), i had 3 days in a week wind for my 9m and i was on a 6'2" surf board always.
I didnt ride the lagoon so much so i cant say anything, i ride mostly Campeche, and Joaquina.
But THE BEST place to ride waves is Ibiraquera, its lockated 1h South from Floripa island, i recomend you to stay there when the forecast will give north winds...you will get crazy of the waveriding quality there...extra long left breaker and side off shore wind from left (not so gusty) in Ibiraquera i had also a few days with 7m and 5'10" the waves are SUPER GLASSY there!!!!
If you need any info regarding places to stay or whatever feel free to contact me, my web is www.paroskite.gr
my name is George Georgoudakis