Taking into account the local weather in Pemalang is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually October and September with an average temp of 81°F, while the coldest months are July and August with an average of 80°F. The rainiest months in Pemalang are January, February, December, and March, with each month seeing an average of 19 inches of rainfall.