The period covering the months of November to February is the wettest in Borneo. However, throughout the year, you can expect average temperatures to remain between 27 and 32 degrees Celsius with about 80 percent humidity. Accommodation is normally hard to come by during the high season in Borneo, which usually has warm and dry weather and runs from May through to September.
Borneo Weather In A Nut Shell
You should not be too worried about the weather when scheduling a trip to Borneo, even though when it comes to tourism there is a high season and a low season.
In Borneo, while some areas are experience high rainfall, the opposite may be happening in some regions in the same country, where warm and dry weather may be the norm; Borneo weather is complex and conditions tend to be localised. Weather conditions may change unexpectedly, causing sunshine to turn into rain, or the opposite, quite quickly in Borneo, as rain may fall during any time of the year, just like on any other tropical island.
With 80 percent relative humidity through most parts of the year, Borneo also has a relatively constant temperature ranging from 27 to 32 degrees Celsius.
While 220 millimetres is the average monthly rainfall for most destinations, the yearly average may rise beyond 4,000 millimetres in some parts of Borneo. The months of November to March mark the rainiest period in Borneo; however, even during these months predicting the driest or wettest weeks is nearly impossible as rainfall continues to be irregular.
Lower visitor numbers during the rainier months may actually work out for you as the jungle lodges, national parks, dive sites, wildlife sanctuaries and caves tend to be less packed by people, giving you a great opportunity to enjoy a one of a kind experience.
In Sarawak, where most of the rain falls in January with June and July being the driest months, it distinguishing the dry season from the wet season is easier than in Sabah. Depending on the time of the year and location, annual average temperatures range from 23 to 32 degrees Celsius.
During the months of April through to September, the weather in the beaches along the Sarawak coast near Kuching is usually dry; while the period from December to January tends to be rainier.
However, throughout the year, higher rainfall levels are experienced in areas of Sarawak that are further inland, with the months of August and June experiencing the lowest amount of rainfall.
This region covers Sepilok, Kinabalu NP, Kota Kinabalu, Gaya Island, Mabul and Sipadan Islands, Danum Valley, Lankayan and Selingan Islands as well as Kinabatangan River where you can take an amazing Kinabatangan river cruise.
The dry season covering the period between the months of February and August and the wet season which covers the period between the months of September and January, are the two main seasons experienced in Sabah. But, it is important to note that the weather and rainfall patterns which are highly irregular make drawing a line between these two seasons quite hard. With only a 2 degree Celsius variation in the annual average, this part of Borneo experiences relatively consistent temperatures during the year, and lower rainfall than Sarawak.
While it’s true that the months of February to March experience a small decrease in rainfall levels, the southern portion of Sabah receives lower but evenly distributed rainfall during the year as compared to the northern portion.
Cooler temperatures are experienced in Kinabalu National Park, than in the nearby low lying areas, thanks to its higher altitude.