Sumatra in Indonesia sees its peak temperatures in May (33°C (91°F)) and its coolest in December (31°C (88°F)). For a full breakdown of what to expect throughout the year, we've put together a climate overview based on data from Medan, the region's most visited city. For more detailed climate information about other cities in the area, please see the section beneath the map further down the page.
High temperatures are a constant in Sumatra, especially in Medan, with average maximums staying above 31°C (88°F) all year long.
The peak heat season generally takes place in April, May and June.
Precipitation in Sumatra varies considerably throughout the year. The wettest conditions occur in November with 377 mm (15 in) of rain, while February stays relatively dry with 176 mm (6.9 in).
Visitors hoping to maximize their time in the sun should consider planning their trip for June, when daylight hours are at their peak.
