If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Duy Xuyen: The hottest months are usually June and July, with an average temperature of 28°C, while the coldest months are January and February, with an average of 22°C. The rainiest months in Duy Xuyen are November, October, September and December, with each month seeing an average of 475 mm of rainfall.