Weather will likely play an important role when you plan your trip to Sematan, but bear in mind that cheaper options are usually available when the weather isn’t as good. 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 rainiest months in Sematan are December, January, November and October, with each month seeing an average of 375 mm of rainfall.