The high rainfall of the area results in dense rain forest along this narrow coastal strip.

Rain increases somewhat from February to April, and then the main monsoon season begins in May, lasting until October.

The rains ease in November, although significant rainfall may still occur.

The highest monthly rainfall recorded from 1961 to 1990 was a total of 2,072.4 millimetres (81.59 in) in August.

To the south it connect Khlong Yai to a border crossing to Cambodia at Hat Lek, not far from the Cambodian town of Koh Kong.