September is a month of trade-offs across Vietnam. Here is what to expect, region by region.
The rain eases late in the month and the harvest begins: September is the classic month for golden terraces in Mu Cang Chai and Sa Pa.
| Destination | Avg high | Rain | Rating |
|---|---|---|---|
| Ba Be Lake & Bac Kan | 31°C | 254 mm | Fair |
| Cao Bang | 30°C | 264 mm | Fair |
| Bac Ninh | 31°C | 334 mm | Fair |
| Hanoi | 31°C | 352 mm | Fair |
The weather turns: heavy rain and typhoon risk return to the central coast. Some sea trips are cancelled.
| Destination | Avg high | Rain | Rating |
|---|---|---|---|
| Da Nang | 31°C | 255 mm | Fair |
| Quy Nhon | 32°C | 259 mm | Fair |
| Dak Nong Geopark | 28°C | 343 mm | Fair |
Among the wettest months. In the Mekong Delta the flood season begins — fields turn to lakes and water lilies bloom.
| Destination | Avg high | Rain | Rating |
|---|---|---|---|
| Mui Ne & Phan Thiet | 31°C | 206 mm | Good |
| Vung Tau | 29°C | 254 mm | Good |
| Bac Lieu | 30°C | 325 mm | Fair |
| Chau Doc & An Giang | 31°C | 336 mm | Fair |
| Dong Thap | 31°C | 355 mm | Fair |
| Ben Tre | 30°C | 372 mm | Wet / extreme |
| Dong Nai & Cat Tien | 30°C | 406 mm | Wet / extreme |
| Binh Duong | 31°C | 410 mm | Wet / extreme |
In September, expect heavy rain or uncomfortable heat or cold in Ben Tre, Dong Nai & Cat Tien and Binh Duong. You can still go — just keep plans flexible.