Phong Nha weather in May
May in Phong Nha: hot, rainy, with very humid — a gamble, with sticky heat.
#7 of 12 months in Phong Nha · #866 of 897 destinations to visit in May · comfort 54/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Phong Nha in May
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Phong Nha climate normals — May
| Daytime high | 33°C / 92°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Rainfall | 112 mm / 4.4 in | 🌧 rainy |
| Rainy days | 16 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10.4 h/day | |
| Daylight | 13 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 56 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Phong Nha in May — FAQ
- Is May a good time to visit Phong Nha?
- May in Phong Nha: hot, rainy, with very humid — a gamble, with sticky heat. It ranks #7 of 12 months for Phong Nha on SeasonMap's comfort score (54/100).
- What is the weather like in Phong Nha in May?
- In May, Phong Nha averages a daily high of 33.1°C and a low of 26.2°C, with about 112.4 mm of rain over roughly 15.8 rainy days.
- What is the air quality in Phong Nha in May?
- Phong Nha has a mean US Air Quality Index of about 56 in May.