Rain sensing system for a vehicle and control method thereof

A rain sensing system for a vehicle is provided, which secures vision of a driver by automatically driving a wiper by detecting the rain if it rains. A rain sensing system for a vehicle comprises: piezoelectric sensors(10,20) which can sense whether it rains or not by using the pressure applied to the vehicles; a controller(30) outputting the control signal removing the rain on the vehicle front glass according to the sensed value; a wiper motor(40) which is driven according to the output of controller in order to remove the rain of the vehicles front glass; and a current sensor(35) sensing the current inputted to the wiper motor and reading the frictional force between the wiper and the front glass.