Hoi An Vietnam Weather. Unlike Northern Vietnam, Hoi An is a city of two seasons with warm weather averaging 29°C dominating for most of the year. The wet monsoon season spans the months from September through to January with a dry season for the rest of the year. Most days temperatures average between 25°C and 30°C with the hottest months being June and July. Hoi An locates in a humid tropical monsoon climate, characterizes by coastal climate in Central Vietnam. Both hot and humid, heavy rain and seasonal rain. Moreover, Hoi An has high temperatures all year round. Hoi An has no cold winter, the dry season lasts from February to August. The short rainy season lasts from September to January. In addition, the average temperature is 25-26 degrees Celsius. The highest temperature reaches 39 degrees Celsius. The lowest temperature is 23 degrees C. The annual heat amplitude is high.

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