If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Sentul City: The hottest months are usually September and October with an average temp of 81°F, while the coldest months are July and August with an average of 79°F. The rainiest months in Sentul City are February, March, January, and December, with each month seeing an average of 13 inches of rainfall.