On the whole, Sarawak has an equatorial climate. The temperature is relatively uniform within the range of 23°C to 32°C throughout the year. During the months of March to September, the weather is generally dry and warm.

Humidity is consistently high on the lowlands ranging from 85 per cent to 95 per cent per annum. The average rainfall per year is between 3,300 mm and 4,600 mm, depending on locality, and the wettest months are from November to February.