The best time to go to Sumbas is during late spring (April to June) and early autumn (September to October) when the weather is most pleasant.
During these months, you'll experience mild temperatures, typically ranging from 20°C to 28°C, with less humidity than the summer months. This makes it ideal for exploring the natural beauty of the region, such as the surrounding forests and hills, without the discomfort of intense heat. It's also a great time for outdoor activities like hiking or visiting local markets.
For those looking to enjoy the warmest weather, July and August offer higher temperatures, often exceeding 30°C. This period is superb for travellers who enjoy hot weather and wish to engage in water-based activities in nearby areas, though Sumbas itself is more inland. However, be prepared for strong sunshine and plan your outdoor excursions for the cooler parts of the day.