the average precipitation for march is 104 millimeters, with an average of 12 wet days, which gives it a 40% percent chance of having some rain during the month.

this link gives access to detailed  daily, weekly, and monthly weather forecasts, as well as sunrise and sunset times.

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 march.