Malaysian Borneo consists of the two Malaysian states of Sabah and Sarawak and encompasses almost the whole of the northern part of the island of Borneo.  The region covers a vast area and have slightly different weather patterns from one place to another.

The main regions are:

1) South Sabah is where the town of Tawau is. The coast faces the Celebes Sea and is where the islands of Sipadan and Mabul are. Rainfall is more uniform throughout the year although the months of February to April are noticeably dryer than the other months.

2) North-East Coast of Sabah is where the towns of Kudat and Sandakan is. The coast faces the Celebes (Sulawesi) sea and is influenced by the winds of the north-east monsoon from November to March. The maximum rainfall occurs in December/January and the minimum rainfall in April/May.

 

3) North-West Coast of Sabah  is where the towns of Kota Kinabalu and Labuan are. The coast faces the South China Sea and has two maximum rainfall periods. The primary maximum rainfall occurs in October and the secondary maximum in June. The minimum rainfall occurs in February/March. Miri across the border in Sarawak state shares almost similar characteristics with the north-west coast of Sabah. 

4) Interior Regions of Sabah which are predominantly hilly and mountainous, precipitation is relatively lower than the other regions and rainfall is generally uniform throughout the year with February and August with the minimum rainfall and May and October the maximums.

5) Sarawak is where the towns of Bintulu, Sibu and Kuching is. The coast faces the South China Sea and is influenced by the wetter winds of the north-east monsoon from November to March, and the dryer south-west monsoon from May to September. The maximum rainfall occurs in January and the minimum rainfall in June and July.

6) Interior Regions of Sarawak have a more uniform rainfall distribution pattern being far from the coast. June to August are slightly dryer due to the influence of the south-west monsoon.