Hoi An Climate by Month
Hoi-An has a tropical climate. Temperature differences are not so big between summer and winter. From mid-October to mid-December you have a possible chance of cyclones on the coast. During this period you can also experience of a lot of rainfall that can lead to local flooding. It is not that you can not visit Hoi-An during this period, but the weather is unpredictable. Best travel time would be from February until October.
The graphs below provide an overview of the climate in Hoi An (Quang Nam), Vietnam. They present long-term patterns and averages of weather conditions over a 30-year period.