Pekanbaru City is a city with a tropical climate with a minimum air temperature of 20.2ºC-23.0ºC and a maximum of 34.1ºC-35.6ºC and precipitation of 38.6- 435.0mm/year with the average rainy season from September until April. A prediction of precipitation is required to avoid the impact caused by the high precipitation. This research aims to predict the precipitation period of Pekanbaru Cit…