Mount Mulu
Mountain Limestone massif in Borneo, famous for caves
At the heart of Sarawak’s Gunung Mulu area, Mount Mulu anchors rainforest trails, cave systems and canopy walks; visitors combine trekking with spelunking and biodiversity observation.
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Mount Mulu is a prominent peak within Gunung Mulu National Park in Sarawak, Malaysian Borneo. The park is internationally recognised for its karst caves and rich tropical biodiversity.
The mountain forms part of the park’s montane zone and is visited by hikers using established trails that connect lowland rainforest to higher-elevation forest types. The wider park is home to major cave systems such as Deer Cave and Clearwater Cave and supports diverse flora and fauna.
The mountain and surrounding park have been the focus of biological exploration and conservation due to the high species diversity and distinctive karst topography. Access is organised from the Mulu park headquarters and village; travel normally involves boat or small aircraft to the park followed by guided treks.
Mount Mulu sits in northern Sarawak on the island of Borneo, within a protected national park boundary characterised by steep limestone and sandstone terrain and dense tropical forest.
- Protected area and caves: Located within Gunung Mulu National Park, a protected area in Sarawak noted for extensive cave systems and karst features. The park contains some of the world's largest cave passages and rich lowland-to-montane rainforest.
How to Get to Mount Mulu #
Gunung Mulu National Park is reached primarily by small plane from Miri or Kuching to Mulu Airport, followed by short transfers to the park headquarters. Some longer river routes exist but are less commonly used by international visitors.
Tips for Visiting Mount Mulu #
- Reserve flights and the park entrance permit well in advance - access is limited and the park controls visitor numbers.
- Bring a headlamp for cave trips; even guided tours through Deer Cave and Clearwater require solid lighting.
- Expect sudden tropical downpours in the afternoon; waterproof cases for gear are sensible.
Best Time to Visit Mount Mulu #
March-September is generally the best period for trekking and cave visits; wet months can limit access.
Weather & Climate near Mount Mulu #
Mount Mulu's climate is classified as Oceanic - Oceanic climate with consistently warm temperatures year-round. Temperatures range from 12°C to 21°C. Heavy rainfall (2869 mm/year), wettest in November, distributed fairly evenly throughout the year.
January
January is the coolest month with highs of 20°C and lows of 13°C. Heavy rain (212 mm) and mostly overcast skies.
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February
February is the coolest month with highs of 20°C and lows of 12°C. Significant rainfall (183 mm) and mostly overcast skies.
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March
March is cool with muggy conditions (dew point 22°C). Heavy rain (229 mm) and mostly overcast skies.
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April
April is cool with muggy conditions (dew point 23°C). Heavy rain (269 mm) and mostly overcast skies.
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May
May is cool with muggy conditions (dew point 23°C). Heavy rain (282 mm) and mostly overcast skies.
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June
June is cool with muggy conditions (dew point 22°C). Heavy rain (216 mm) and mostly overcast skies.
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July
July is the coolest month with highs of 20°C and lows of 12°C. Significant rainfall (182 mm) and mostly overcast skies.
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August
August is cool with highs of 20°C and lows of 12°C. Heavy rain (203 mm) and mostly overcast skies.
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September
September is the coolest month with highs of 20°C and lows of 12°C. Heavy rain (260 mm) and mostly overcast skies.
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October
October is the coolest month with highs of 20°C and lows of 13°C. Heavy rain (278 mm) and mostly overcast skies.
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November
November is cool with muggy conditions (dew point 22°C). The wettest month with heavy rain (290 mm) and mostly overcast skies.
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December
December is cool with muggy conditions (dew point 22°C). Heavy rain (265 mm) and mostly overcast skies.
