If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Duy Xuyen: The hottest months are usually June and July with an average temp of 83°F, while the coldest months are January and February with an average of 72°F. The rainiest months in Duy Xuyen are November, October, September, and December, with each month seeing an average of 19 inches of rainfall.