Weather is probably a major factor when you plan your trip to Duong To, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and April with an average temp of 83°F, while the coldest months are January and December with an average of 81°F. The rainiest months in Duong To are September, July, October, and August, with each month seeing an average of 13 inches of rainfall.