September is a transitional month with a clear north-south divide. The north begins its beautiful, drier autumn — widely considered one of the best times to visit — while central Vietnam’s wet season starts in earnest, and the south’s rains begin to taper as it heads toward its dry season.
Weather by Region
North (Hanoi, Ha Long, Sapa, Ninh Binh, Ha Giang, Mai Chau): Turning pleasant and drier, cooling from summer highs, marking the start of the region’s best season.
Central (Hue, Da Nang, Hoi An, Nha Trang, Phong Nha, Quy Nhon, Da Lat): Wet season begins, with increasing rain and rising flood/typhoon risk building toward the Oct-Nov peak; Da Lat stays cool at 15-24°C.
South (Ho Chi Minh City, Mekong Delta, Phu Quoc, Mui Ne, Con Dao): Still in the wet season but with rain gradually easing later in the month, hot and humid, 25-34°C.
Where to Go in September
- Hanoi, Ha Long Bay, and Ninh Binh as the north’s autumn begins, offering some of the best conditions of the year
- Sapa and Ha Giang for cooler, clearer trekking weather
- Da Lat for consistently cool, pleasant highland air
- Southern beaches like Phu Quoc as wet-season rain starts to ease
Where to Avoid or Plan Around
Central Vietnam’s wet season is starting this month, with rain and typhoon/flood risk building toward the more severe October-November peak — Hue and Hoi An are particularly worth monitoring. The south remains humid with rain still common for much of the month.
Events & Festivals
No major nationwide festivals typically fall in September, though it marks a favourable turning point for northern travel.
Practical Tips for September
- Prioritize the north this month for its emerging dry, cool autumn season
- Watch forecasts closely for central Vietnam as wet season risk builds
- Pack rain gear for central and southern travel
- Layer clothing for the north, as mornings and evenings begin to cool