For the most comfortable and enjoyable experience in Mendawai, the best time to visit is during the dry season, which typically runs from May to October.
During these months, you'll find less rainfall and more sunshine, making it ideal for exploring the natural beauty of Central Kalimantan. The drier conditions are particularly good for river excursions and wildlife spotting, as animals are often more active and visible. It's also a more convenient time for travel within the region, with roads and river access generally being in better condition.
The shoulder months of April and November can also be a good option for those looking to avoid peak travel times. While there might be occasional showers, the weather is still generally pleasant, and you might find slightly fewer visitors.