this wundermap shows current temperatures for the various districts in rio de janeiro - the map can alos be used to see precipitation, dew point, humidity and visibility.

published by the prefeitura da cidade do rio de janeiro and the instituto municipal de urbanismo pereira passos - ipp the map chuva média anual shows the average rain levels for each area in metropolitan rio de janeiro.

color coding shows how even districts close to one another such as copacabana, leblon, and barra da tijuca are subject to very different levels of yearly precipitations. 

published by the instituto brasileiro de geografia e estatística - ibge, this link opens a high-resolution map of climatic areas in brazil, and rio de janeiro.