Climate averages 1991–2020
Hạ Long weather
in August.
A hot, very wet month: the 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Hạ Long: daytime highs average 30.4°C and nights cool to about 26.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 381 mm of rain on roughly 26 days, which makes August a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 51 min on an average August day.
The nearest other city in this atlas is Cẩm Phả (22 km away). In August its highs average 30.1°C, about as warm as Hạ Long, with 431 mm of rain.
Among the 136 cities listed in Vietnam, Hạ Long ranks joint 79th of 136 for the warmest August highs and joint 129th of 136 for the driest August (rainfall, lowest first). The mean August high of those 136 cities is 30.5°C; Hạ Long is 0.1°C cooler than that mean.
From August to September, average highs fall by 0.8°C to 29.6°C, and monthly rainfall falls from 381 mm to 243 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hạ Long climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.1°C14.6°C | 14.6°C | 34 | 6.4 | 11.011 h |
| February | 20.5°C15.8°C | 15.8°C | 21 | 5.7 | 11.411 h |
| March | 23.2°C18.5°C | 18.5°C | 43 | 8.8 | 12.012 h |
| April | 26.7°C21.8°C | 21.8°C | 69 | 11.6 | 12.613 h |
| May | 29.3°C24.8°C | 24.8°C | 219 | 19.5 | 13.113 h |
| June | 30.8°C26.8°C | 26.8°C | 266 | 22.4 | 13.413 h |
| July | 30.7°C26.8°C | 26.8°C | 305 | 24.3 | 13.313 h |
| August, selected | 30.4°C26.1°C | 26.1°C | 381 | 26.2 | 12.813 h |
| September | 29.6°C25.0°C | 25.0°C | 243 | 20.0 | 12.312 h |
| October | 27.8°C22.9°C | 22.9°C | 104 | 11.9 | 11.712 h |
| November | 24.8°C19.6°C | 19.6°C | 51 | 8.2 | 11.211 h |
| December | 20.8°C15.8°C | 15.8°C | 31 | 5.9 | 10.911 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Cẩm Phả in AugustVietnam · 22 kmHigh 30.1°C · Low 26.0°C · 431 mm rain
- Haiphong in AugustVietnam · 42 kmHigh 30.8°C · Low 25.8°C · 381 mm rain
- Kiến An in AugustVietnam · 49 kmHigh 30.7°C · Low 26.0°C · 381 mm rain
- Thị Trấn Mạo Khê in AugustVietnam · 51 kmHigh 31.2°C · Low 25.6°C · 354 mm rain
- Thị Trấn Đông Triều in AugustVietnam · 60 kmHigh 31.2°C · Low 25.5°C · 354 mm rain
- Chũ in AugustVietnam · 71 kmHigh 30.9°C · Low 24.9°C · 366 mm rain
- Hải Dương in AugustVietnam · 77 kmHigh 31.3°C · Low 25.6°C · 353 mm rain
- Chí Linh in AugustVietnam · 80 kmHigh 31.4°C · Low 25.5°C · 353 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hạ Long) is explained once on the Hạ Long year overview and on the Sources, method and limits page.