Weather is probably a major factor when you plan your trip to Castara, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October, with an average temperature of 28°C, while the coldest months are February and January, with an average of 27°C. The rainiest months in Castara are November, July, October and August, with each month seeing an average of 209 mm of rainfall.