Planning for the weather is an important factor for making your trip to South Tangerang a success, especially when you’re splurging. 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 South Tangerang are February, January, March, and December, with each month seeing an average of 11 inches of rainfall.