Click on a day for an hourly weather forecast
The weather in Ha Long Bay in September is very hot. The average temperatures are between 26°C and 32°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Ha Long Bay. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Ha Long Bay in September 2025.
If you’re planning to visit Ha Long Bay in the near future, we highly recommend that you review the 14 day weather forecast for Ha Long Bay before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 20° / 15° | 4 | 27 | 0 | 50 mm | Good | Ha Long Bay in January |
| February | 22° / 17° | 3 | 26 | 0 | 34 mm | Good | Ha Long Bay in February |
| March | 24° / 20° | 4 | 27 | 0 | 59 mm | Perfect | Ha Long Bay in March |
| April | 28° / 22° | 4 | 26 | 0 | 86 mm | Perfect | Ha Long Bay in April |
| May | 31° / 25° | 12 | 19 | 0 | 237 mm | Ok | Ha Long Bay in May |
| June | 33° / 27° | 16 | 14 | 0 | 333 mm | Ok | Ha Long Bay in June |
| July | 33° / 27° | 19 | 12 | 0 | 406 mm | Ok | Ha Long Bay in July |
| August | 32° / 27° | 17 | 14 | 0 | 464 mm | Ok | Ha Long Bay in August |
| September | 32° / 26° | 11 | 19 | 0 | 274 mm | Ok | Ha Long Bay in September |
| October | 29° / 23° | 5 | 26 | 0 | 141 mm | Good | Ha Long Bay in October |
| November | 26° / 20° | 3 | 27 | 0 | 46 mm | Perfect | Ha Long Bay in November |
| December | 22° / 16° | 2 | 29 | 0 | 32 mm | Good | Ha Long Bay in December |