If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Tân Lập: The hottest months are usually June and May with an average temp of 82°F, while the coldest months are January and February with an average of 75°F. The rainiest months in Tân Lập are November, October, December, and September, with each month seeing an average of 10 inches of rainfall.