Sumatra Weather

Sitting astride the equator, Sumatra's climate is about as tropical as tropical gets. Daytime temperatures seldom fail to reach 30°C (86°F) on the coast, but fortunately the weather is appreciably cooler inland around the mountains. Places like Berastagi, Bukittinggi and Danau Toba get cool enough at night to warrant a blanket. The dry season runs from May to September. The timing of the wet season is hard to predict. In the north, the rains start in October, and December/January are the wettest months; in the south, the rains start in November, peaking in January/February. Bengkulu and West Sumatra are the wettest places, with average rainfall approaching 3500mm.