Weather is probably a major factor when you plan your trip to Kasulu, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and August, with an average temperature of 25°C, while the coldest months are July and January, with an average of 24°C. The rainiest months in Kasulu are April, December, March and November, with each month seeing an average of 331 mm of rainfall.