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Borneo Weather, climate and geography
Weather & climate
Borneo has an equatorial climate, meaning temperatures remain warm and fairly consistent throughout the year. Daytime temperatures typically range from about 27°C to 32°C (81°F to 90°F), while nights are slightly cooler, usually between 23°C and 25°C (73°F to 77°F). Humidity is high year-round.
Rainfall occurs throughout the year, but the wettest period generally falls between November and February during the northeast monsoon, when heavier and more frequent rain showers are common. The months from March to October are usually slightly drier, although short tropical downpours can still occur at any time.
The best time to visit Borneo is generally from March to October, when rainfall is typically lower and conditions are often more favourable for activities such as wildlife watching, trekking and diving. Coastal areas and islands may have slightly different weather patterns, but temperatures remain warm year-round.
Lightweight, breathable clothing is recommended for travel in Borneo due to the island's warm, humid tropical climate. Cotton or other light fabrics are ideal for everyday wear. Comfortable walking shoes are advisable for exploring cities, markets and natural attractions.
Visitors planning to explore rainforests or national parks should bring long trousers, long-sleeved shirts and sturdy footwear to protect against insects, leeches and vegetation along jungle trails. A lightweight rain jacket or poncho is useful year-round, as sudden tropical downpours are common, particularly during the wetter months from November to February.
Swimwear is appropriate for beaches and resort areas, though it is generally not worn away from these locations. When visiting religious sites such as mosques or temples, modest clothing is expected. This typically means covering shoulders and knees, and visitors may be required to remove shoes before entering.
While Malaysian Borneo and parts of Indonesian Kalimantan are relatively relaxed in terms of dress, visitors to Brunei should take particular care to dress modestly in public places. Revealing clothing is discouraged, and modest attire is especially important when visiting mosques or government buildings.
Geography
Borneo is the third-largest island in the world, covering about 748,168 sq km in Southeast Asia. It is divided between three countries: Malaysia in the north (Sabah and Sarawak), Indonesia in the south and central regions (Kalimantan), and the small sultanate of Brunei on the northern coast. The island is surrounded by the South China Sea to the northwest, the Sulu Sea to the northeast, the Celebes Sea to the east and the Java Sea to the south.
The terrain is dominated by vast tropical rainforests, mountain ranges and extensive river systems. Much of the island's interior is rugged and sparsely populated, with dense jungle covering large areas. Major rivers such as the Kapuas, Mahakam and Rajang serve as important transport routes through remote regions where road access can be limited.
The highest point on the island is Mount Kinabalu (4,095m / 13,435ft) in Sabah, Malaysia. Located within Kinabalu Park, a UNESCO World Heritage Site, the mountain is one of Southeast Asia's most prominent peaks and a major attraction for hikers and climbers.
Borneo's coastline varies from sandy beaches and mangrove forests to river deltas and coral-fringed islands. The lowest points lie at sea level along these coastal plains, where many of the island's major cities and ports are located. Inland, the terrain rises into hills and mountains before descending again into vast lowland forests and wetlands.
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