Ha Long weather in May
May in Ha Long: hot, soaked, with very humid — fine if you can take 19 rainy days.
#3 of 12 months in Ha Long · #493 of 897 destinations to visit in May · comfort 81/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ha Long in May
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Ha Long climate normals — May
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Rainfall | 159 mm / 6.3 in | ⛈ soaked |
| Rainy days | 19 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 23°C / 74°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 13.1 h | |
| Wind | 17 km/h / 10 mph | |
| Air quality (US AQI) | 89 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Ha Long in May — FAQ
- Is May a good time to visit Ha Long?
- May in Ha Long: hot, soaked, with very humid — fine if you can take 19 rainy days. It ranks #3 of 12 months for Ha Long on SeasonMap's comfort score (81/100).
- What is the weather like in Ha Long in May?
- In May, Ha Long averages a daily high of 29.8°C and a low of 25.7°C, with about 159.1 mm of rain over roughly 18.8 rainy days.
- What is the air quality in Ha Long in May?
- Ha Long has a mean US Air Quality Index of about 89 in May.