Increased temperature rates have the potential to change the rainfall regime in a given region, as well as to intensify its extreme events, which may lead to signi cant and negative socioeconomic and environmental impacts on urban populations. However, knowledge about the extent of changes in rainfall rates in Rio de Janeiro City (RJC) remains incipient; thus, it is necessary applying indices climate change to help better understanding this phenomenon. The aim of the current study is to investigate changes in rainfall distribution and increases in the number of extreme rainfall events in RJC. Daily rainfall data deriving from fteen weather stations distributed in RJC were analyzed in the Rclimdex software and Mann-Kendall test. The analysis has shown increased rainfall rates from the beginning of the series to approximately the rst ten years of study. Total rainfall rate has decreased after this period. Rainfall intensity (SDII) in almost all seasons has decreased after 2005; this outcome has indicated reduced annual rainfall rate (PRCPTOT) and number of wet days (CWD). However, there was prevalence of positive trends in daily rainfall rates (Rx1day) and in total rainfall of ve consecutive days (Rx5day). The increased number of extreme rainfall events in RJC can cause sudden inundations, oods, runoffs and river over ows with potential to cause landslides and human death due to irregular occupation of hills and slopes.Stations comprising historical rainfall series that did not present signi cant database aws from 1997 to 2017 were taken into consideration to assure greater result reliability (Table 1). Table 1 -Geographic information about the stations used for analysis purposes. Stations Latitude (°) Longitude (°) level (m) Anchieta -22.82694 -43.40333 50 Bangu -22.88028 -43.46583

Increased temperature rates have the potential to change the rainfall regime in a given region, as well as to intensify its extreme events, which may lead to significant and negative socioeconomic and environmental impacts on urban populations. However, knowledge about the extent of changes in rainfall rates in Rio de Janeiro City (RJC) remains incipient; thus, it is necessary applying indices climate change to help better understanding this phenomenon. The aim of the current study is to investigate changes in rainfall distribution and increases in the number of extreme rainfall events in RJC. Daily rainfall data deriving from fifteen weather stations distributed in RJC were analyzed in the Rclimdex software and Mann-Kendall test. The analysis has shown increased rainfall rates from the beginning of the series to approximately the first ten years of study. Total rainfall rate has decreased after this period. Rainfall intensity (SDII) in almost all seasons has decreased after 2005; this outcome has indicated reduced annual rainfall rate (PRCPTOT) and number of wet days (CWD). However, there was prevalence of positive trends in daily rainfall rates (Rx1day) and in total rainfall of five consecutive days (Rx5day). The increased number of extreme rainfall events in RJC can cause sudden inundations, floods, runoffs and river overflows with potential to cause landslides and human death due to irregular occupation of hills and slopes.