Phong Nha weather in September
September in Phong Nha: hot, soaked, with clean air — not the time — 22 rainy days.
#10 of 12 months in Phong Nha · #865 of 897 destinations to visit in September · comfort 48/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Phong Nha in September
No notes yet. Open Phong Nha on the map to add the first one.
Phong Nha climate normals — September
| Daytime high | 31°C / 87°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 395 mm / 15.6 in | ⛈ soaked |
| Rainy days | 22 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 25°C / 76°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 12.2 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Phong Nha?
Loading map…
Phong Nha in September — FAQ
- Is September a good time to visit Phong Nha?
- September in Phong Nha: hot, soaked, with clean air — not the time — 22 rainy days. It ranks #10 of 12 months for Phong Nha on SeasonMap's comfort score (48/100).
- What is the weather like in Phong Nha in September?
- In September, Phong Nha averages a daily high of 30.5°C and a low of 25.1°C, with about 395.1 mm of rain over roughly 22.2 rainy days.
- What is the air quality in Phong Nha in September?
- Phong Nha has a mean US Air Quality Index of about 42 in September.