You'll likely spend much of your trip indoors, but if you want to see more of the area, taking a look at local weather data can help you. The hottest months are usually May and August, with an average temperature of 27°C, while the coldest months are February and March, with an average of 26°C. The rainiest months in Sibu are December, January, November and October, with each month seeing an average of 340 mm of rainfall.