Taking into account the local weather in Pelabuhan Ratu can help you maximize your time at the pool during your trip. The hottest months are usually September and August with an average temp of 77°F, while the coldest months are July and August with an average of 77°F. The rainiest months in Pelabuhan Ratu are December, November, March, and April, with each month seeing an average of 18 inches of rainfall.