We have possibility of seaweed from about May to December - with the hottest months having the best chance of seaweed. This year June Grass came pretty late but we have had so much rain and stormy weather that the water has been unusually muddy and brown. It's a good bet that all the runoff adds more fertilizer (and pollutants) to the Gulf, spurring algae blooms.
Water conditions can change in a hurry for the better or worse.
The clearest water conditions are when the water is the coldest. Winter and spring are the best bets for clear water. Often times March through June are perfect. Sometimes May and June have plenty of June Grass.