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In terms of precipitation, rainfall in Bintulu ranges from 9.1 - 17.7 inches per month. December is typically the wettest month, when rainfall can reach 17.7 in. July is typically the driest time to visit Bintulu when rainfall is around 9.1 in.
If weather is an important factor for your trip to Bintulu, use this chart to help with planning. For those seeking warmer temperatures, March is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 78.8 F).