The Kadassa River (Indonesian: Luku Kadahang) 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 26 °C. The warmest month is October, when the average temperature is around 32 °C, and the coldest is January, at 24 °C. The average annual rainfall is 1441 mm. The wettest month is February, with an average of 206 mm rainfall, and the driest is September, with 8 mm rainfall.

Luku Kadahang
Climate chart (explanation)
J F M A M J J A S O N D     222     25 22     257     27 22     207     27 23     172     25 23     127     30 23     47     27 22     31     30 21     13     32 21     8     37 22     33     40 24     99     35 24     225     27 22 █ 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     8.7     77 72     10     81 72     8.1     81 73     6.8     77 73     5     86 73     1.9     81 72     1.2     86 70     0.5     90 70     0.3     99 72     1.3     104 75     3.9     95 75     8.9     81 72 █ 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°23′38″S 120°01′37″E / 9.3938°S 120.0269°E / -9.3938; 120.0269