If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Sandakan: The hottest months are usually May and June, with an average temperature of 27°C, while the coldest months are February and January, with an average of 26°C. The snowiest months in Sandakan are April, May, August and July, with each month seeing an average of 211 cm of snowfall.