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

more weather-related maps are available on this link, and on this link we listed all major events taking place in rio de janeiro in the month of may .

the instituto nacional de metereologia - inmet  (National Institute of meteorology) provides a wealth of information for all regions of brazil and rio de janeiro state, including Agrometeorology, fire risks, rain maps, satellite imagery, infrared imagery, and statistical databases.