Ha Long weather in September
September in Ha Long: hot, soaked, with very humid — fine if you can take 23 rainy days.
#11 of 12 months in Ha Long · #661 of 897 destinations to visit in September · comfort 70/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ha Long in September
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Ha Long climate normals — September
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Rainfall | 269 mm / 10.6 in | ⛈ soaked |
| Rainy days | 23 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 25°C / 76°F | |
| Sunshine | 8.3 h/day | |
| Daylight | 12.3 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 80 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Ha Long in September — FAQ
- Is September a good time to visit Ha Long?
- September in Ha Long: hot, soaked, with very humid — fine if you can take 23 rainy days. It ranks #11 of 12 months for Ha Long on SeasonMap's comfort score (70/100).
- What is the weather like in Ha Long in September?
- In September, Ha Long averages a daily high of 30.1°C and a low of 25.5°C, with about 268.7 mm of rain over roughly 22.8 rainy days.
- What is the air quality in Ha Long in September?
- Ha Long has a mean US Air Quality Index of about 80 in September.