the website waves includes charts showing tides, winds, temperatures and overall climate forecasts - containing constantly updated data provided by the brazilian navy, waves is a valuable resource for anyone planning to surf on any beaches in rio. 

published by surfline, this page displays the forecast for praia da macumba, and on this page for the curvão da macumba.

also by surfline, this clickable map shows the height of the waves on a number of beaches in both rio de janeiro and niterói - and this chart shows the forecast for all waves in rio's southern region.