taking a ride on a yacht is a unique experience that can be enjoyed in a place like rio de janeiro seeing as the city and state is filled with naturally breathtaking beauty - aside from the different charter companies and ports and marinas, here is a few resourceful websites that can help facilitate one's journey at sea.

this page published and updated daily by the brazilian navy shows the overall daily forecast for rio de janeiro state's coast, including waves (ondas), visibility (visibilidade), and maximum and minimum temperatures (temperatura). 

this page shows the forecast for guanabara bay - update daily by the brazilina navy, information of the tides in the entrance of rio's port is presented in conjuction with wind, visibility, time or sun and moon rising, minimum and maximum temperatures.