The river flows in the northeast area of Kalimantan with a predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).[3] The annual average temperature in the area is 20 °C. The warmest month is October when the average temperature is around 22 °C, and the coldest is July, at 19 °C.[4] The average annual rainfall is 3957 mm. The wettest month is September, with an average of 446 mm rainfall, and the driest is April, with 269 mm rainfall.[5]
| Bahau River
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| Climate chart (explanation) |
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| █ Average max. and min. temperatures in °C |
| █ Precipitation totals in mm | | Source: [4] |
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| Imperial conversion |
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| █ Average max. and min. temperatures in °F |
| █ Precipitation totals in inches |
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