Abstract: The present disclosure relates to a method and a server for providing alerts for rainfall return periods. The server receives periodic rain intensity measurements from a pluviometer. The server compares a last received rain intensity measurement to a set of rainfall intensity-duration-frequency (IDF) curves for a location of the pluviometer and for a time window corresponding to a periodicity of the rain intensity measurements. Based on this comparison, the server provides a current return period for the location of the pluviometer. The server sends an alert to a remote terminal when a target return period is met or exceeded by the current return period. The server may also calculate a prediction of a future return period for the location of the pluviometer and send an early warning to the remote terminal based on the future return period.