Weather is probably a major factor when you plan your trip to Koror, 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 28°C, while the coldest months are February and March, with an average of 28°C. The rainiest months in Koror are July, June, May and August, with each month seeing an average of 398 mm of rainfall.