Sandakan's Wet Season Sandakan is wet all year round, but by far the wettest period of the year is between November and January.
At this time, you can expect torrential rain - around 17 inches a month, coupled with high temperatures and high humidity.
It's also pretty wet all year round - it is a rainforest, after all.
Heavy rain total 28mm , heaviest during Tue night.
Because of its proximity to the equator, it is hot all year round, with little seasonal variation in temperatures.
Clearly this isn't ideal for a beach holiday, but nor is it ideal for more active pursuits.