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Hạ Long weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Hạ Long?
For a warm holiday, the best week has been 6–12 November (Weather Index 89). Favourable start dates for a 7-day trip run from 27 October to 12 November. June is warmest (33°C), December is driest and May has the most sun.
- Warmest
- June 33°C
- Coolest
- January 20°C
- Driest
- December 13% rain-day chance
- Wettest
- August 91% rain-day chance
- Sunniest
- May 10 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Hạ Long
Hạ Long historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 20.4 | 15.9 | 25.5 | 7.9 | 38.7 | 5.7 |
| February | 21.0 | 16.6 | 20.0 | 5.6 | 28.3 | 5.9 |
| March | 23.9 | 19.8 | 32.3 | 10.0 | 39.2 | 7.0 |
| April | 27.4 | 22.8 | 38.0 | 11.4 | 66.7 | 9.1 |
| May | 30.7 | 25.9 | 63.2 | 19.6 | 184.9 | 9.8 |
| June | 32.7 | 27.9 | 73.3 | 22.0 | 266.1 | 8.8 |
| July | 32.4 | 27.6 | 76.8 | 23.8 | 306.7 | 8.9 |
| August | 31.9 | 26.9 | 90.6 | 28.1 | 460.5 | 7.6 |
| September | 31.6 | 26.3 | 76.0 | 22.8 | 308.8 | 8.4 |
| October | 29.2 | 23.5 | 45.2 | 14.0 | 146.6 | 8.6 |
| November | 26.5 | 20.6 | 28.0 | 8.4 | 37.4 | 8.4 |
| December | 22.2 | 16.7 | 13.2 | 4.1 | 18.8 | 7.0 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.