Mind that if it is clear day, the wind will probably be stronger then the forecast, due to the local effect. If it will be a rainy day, wind is probably very light to none.
Jericoacoara has nice waves, mainly between low and mid tide. The best place to enjoy them is the kitesurfing downwind trip from Prea to Jeri. Nice waves can be found in Jeri itself, but pay attention wind is off-shore so be careful, or pass.