Click on a day for an hourly weather forecast
The weather in Hanoi in September is very hot. The average temperatures are between 25°C and 32°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Hanoi. 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 Hanoi in September 2025.
If you’re planning to visit Hanoi in the near future, we highly recommend that you review the 14 day weather forecast for Hanoi before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 21° / 15° | 3 | 28 | 0 | 43 mm | Good | Hanoi in January |
| February | 24° / 17° | 1 | 27 | 0 | 20 mm | Perfect | Hanoi in February |
| March | 27° / 20° | 2 | 29 | 0 | 40 mm | Perfect | Hanoi in March |
| April | 31° / 22° | 4 | 26 | 0 | 75 mm | Good | Hanoi in April |
| May | 34° / 25° | 11 | 20 | 0 | 166 mm | Bad | Hanoi in May |
| June | 36° / 27° | 12 | 18 | 0 | 204 mm | Bad | Hanoi in June |
| July | 35° / 27° | 16 | 15 | 0 | 267 mm | Bad | Hanoi in July |
| August | 33° / 26° | 16 | 15 | 0 | 284 mm | Ok | Hanoi in August |
| September | 32° / 25° | 12 | 18 | 0 | 207 mm | Ok | Hanoi in September |
| October | 30° / 22° | 5 | 26 | 0 | 106 mm | Good | Hanoi in October |
| November | 27° / 20° | 3 | 27 | 0 | 43 mm | Perfect | Hanoi in November |
| December | 23° / 16° | 2 | 29 | 0 | 29 mm | Perfect | Hanoi in December |