The Kadumbul River is a river of Sumba, East Nusa Tenggara, Indonesia.

The river flows along the northern area of Sumba with predominantly tropical savanna climate (designated as As in the Köppen-Geiger climate classification). 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. 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.

Luku Kadumbul
Climate chart (explanation)
J F M A M J J A S O N D     168     27 23     195     30 24     126     29 23     118     28 24     42     30 23     28     30 21     12     31 21     4     34 22     4     37 22     5     41 24     58     38 25     206     33 23 █ Average max. and min. temperatures in °C █ Precipitation totals in mm Source:
Imperial conversion J F M A M J J A S O N D     6.6     81 73     7.7     86 75     5     84 73     4.6     82 75     1.7     86 73     1.1     86 70     0.5     88 70     0.2     93 72     0.2     99 72     0.2     106 75     2.3     100 77     8.1     91 73 █ Average max. and min. temperatures in °F █ Precipitation totals in inches

• List of drainage basins of Indonesia
• List of rivers of Indonesia
• List of rivers of Lesser Sunda Islands

9°41′22″S 120°30′55″E / 9.68931°S 120.51519°E / -9.68931; 120.51519