August · Vietnam
Best time to visit Phong Nha in August Weather, crowds & prices
Weather in Phong Nha in August
Average temperature 27°C, 148 mm of rain, about 21 days with 6+ hours of sunshine and 86% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
4.7/10
Ranked #7 of 12 months
- Avg temp
- 27°C
- Rainfall
- 148 mm
- Humidity
- 86%
- Days with 6h+ sun
- 21
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
August in Phong Nha scores 4.7/10 for nature and wildlife travel - ranked #7 of 12. Expect around 27°C, 148 mm of rain, and roughly 21 days with 6+ hours of sunshine this month.
Phong Nha anchors the world's largest cave country with Son Doong expeditions and river cave boats. Best window: the drier months outside peak monsoon.
August in Phong Nha — off-season conditions
August averages 27°C (80°F) and humidity near 86%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Monthly rainfall reaches 148 mm — wet for this destination — but about 21 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 4.7/10 here, 7th of 12 months, against 7.3/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella, footwear you can get muddy.
Plan for mid-season pricing, with crowds are moderate.
Flexible dates? March scores 2.6 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Phong Nha in August?
- In August, Phong Nha averages 27°C, 148 mm of rain, and about 21 days with 6+ hours of sunshine. Its climate-comfort score is 4.7/10.
- Is August a good time to visit Phong Nha?
- August earns a 4.7/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Phong Nha in August?
- Expect about 148 mm of rain in August. Average humidity is 86% and there are about 21 days with 6+ hours of sunshine.
Curated in Phong Nha
Tickets & experiences
Things to do in Phong Nha
Phong Nha, Vietnam. Live activities and tours from GetYourGuide, matched to this destination.