Weather is probably a major factor when you plan your trip to Long Seridan, but bear in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually May and March, with an average temperature of 22°C, while the coldest months are July and August, with an average of 22°C. The rainiest months in Long Seridan are November, January, December and March, with each month seeing an average of 471 mm of rainfall.