The river flows along the northern area of Sumba with predominantly tropical savanna climate (designated as As in the Köppen-Geiger climate classification).[4] The annual average temperature in the area is 28 °C. The warmest month is October, when the average temperature is around 32 °C, and the coldest is January, at 25 °C.[5] The average annual rainfall is 966 mm. The wettest month is December, with an average of 206 mm rainfall, and the driest is August, with 4 mm rainfall.[6]