Taking into account the local weather in Tirtamulya is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually September and October with an average temp of 82°F, while the coldest months are July and August with an average of 80°F. The rainiest months in Tirtamulya are February, March, January, and December, with each month seeing an average of 14 inches of rainfall.