Ha Long Bay weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Poor
Best time to visit: November – April
What is the weather like in Ha Long Bay in August?
In August, Ha Long Bay is hot: daytime highs average 31 °C, and even at night it stays warm at around 26 °C. The sea averages 29.8 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It rains often – on about 27 days, adding up to 380 mm. On about 20 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is not an ideal month for a holiday in Ha Long Bay.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 26 | 29 | 36 |
| Day | 31° | 31° | 30° |
| Night | 27° | 26° | 25° |
| Sea | 30° | 30° | 29° |
| Sun | 5 h | 5 h | 5 h |
| Rain days | 25 | 27 | 21 |
More details for August
- Daylight
- 12 h 52 min05:30 – 18:23
- UV index
- 12 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 83 %on averageAll months
- Hot days
- 20 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 50 %47 %
- Sunshineweight 20 %25 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in August
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Ha Long Bay in August: quick answers
Is Ha Long Bay hot in August?
Yes. In August, Ha Long Bay is hot: daytime highs average 31 °C and nights stay around 26 °C. On about 20 days the thermometer climbs to 30 °C or more.
Can you swim in Ha Long Bay in August?
Yes. In August the sea averages 29.8 °C – almost as warm as a bath.
Does it rain much in Ha Long Bay in August?
It rains often – on about 27 days, adding up to 380 mm.
Ha Long Bay month by month
The whole year in Ha Long BayAll destinations: VietnamWhere to go in AugustSea temperature in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences