Hoi An weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: February – April
What is the weather like in Hoi An in September?
In September, Hoi An is hot: daytime highs average 30 °C, and even at night it stays warm at around 26 °C. The sea averages 29.4 °C – almost as warm as a bath. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 23 days, totalling 322 mm. On about 16 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Hoi An.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 29 | 40 | 52 |
| Day | 33° | 30° | 28° |
| Night | 27° | 26° | 24° |
| Sea | 30° | 29° | 28° |
| Sun | 7 h | 6 h | 5 h |
| Rain days | 19 | 23 | 25 |
More details for September
- Daylight
- 12 h 15 min05:35 – 17:49
- UV index
- 12 · extremeclear sky, noon (estimate)
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 13 km/haverage daily peak
- Cloud cover
- 78 %on average
- Hot days
- 16 days30 °C or more
- Time zone
- UTC+7Asia/Ho_Chi_Minh
How the score comes together
- Temperatureweight 50 %59 %
- Sunshineweight 20 %52 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Hoi An in September: quick answers
Is Hoi An hot in September?
Yes. In September, Hoi An is hot: daytime highs average 30 °C and nights stay around 26 °C. On about 16 days the thermometer climbs to 30 °C or more.
Can you swim in Hoi An in September?
Yes. In September the sea averages 29.4 °C – almost as warm as a bath.
Does it rain much in Hoi An in September?
It rains often – on about 23 days, adding up to 322 mm.
Hoi An month by month
The whole year in Hoi AnAll destinations: Vietnam
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)