The Sabah region of Borneo has an equatorial climate and is generally warm and humid year round. Temperatures rarely rise above 90°F (32°C) except on exceptionally hot days, and along the coastal areas rarely drop below 68°F (20°C) at night. In the interior and at higher altitudes it can get quite cool at night however. Relative humidity is usually 70-85%.
Rainfall is common throughout the year, and varies from about 60 inches (150 cm) to over 180 inches (450 cm) per year. In most parts of Sabah the wettest months occur during the North East Monsoon from October through February and the driest months during the South West Monsoon from March to September. That said, there is often there is no significant division between the two "seasons." It is sufficient to say that on the whole, sunny blue skies are the norm but when it rains, the heavens open up and it pours!