If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Tan Phu: The hottest months are usually March and April with an average temp of 82°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Tan Phu are July, September, August, and June, with each month seeing an average of 17 inches of rainfall.