August · Vietnam
Best time to visit Cat Ba Island in August Weather, crowds & prices
Weather in Cat Ba Island in August
Average temperature 28°C, 421 mm of rain, about 18 days with 6+ hours of sunshine and 87% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
3.3/10
Ranked #11 of 12 months
- Avg temp
- 28°C
- Rainfall
- 421 mm
- Humidity
- 87%
- Days with 6h+ sun
- 18
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
August in Cat Ba Island scores 3.3/10 for nature and wildlife travel - ranked #11 of 12. Expect around 28°C, 421 mm of rain, and roughly 18 days with 6+ hours of sunshine this month.
Largest island in Halong/Lan Ha Bay featuring rainforest national parks, bioluminescent plankton, and kayaking.
August in Cat Ba Island: expect compromises
August averages 28°C (83°F) and humidity near 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
421 mm of rain puts this in monsoon territory — about 18 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 3.3/10 here, 11th of 12 months, against 7.9/10 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.
Figure on low-season pricing, with crowds are light for this destination.
Flexible dates? November scores 4.6 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Cat Ba Island in August?
- In August, Cat Ba Island averages 28°C, 421 mm of rain, and about 18 days with 6+ hours of sunshine. Its climate-comfort score is 3.3/10.
- Is August a good time to visit Cat Ba Island?
- August earns a 3.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cat Ba Island in August?
- Expect about 421 mm of rain in August. Average humidity is 87% and there are about 18 days with 6+ hours of sunshine.
Curated in Cat Ba Island
Tickets & experiences
Things to do in Cat Ba Island
Cat Ba Island, Vietnam. Live activities and tours from GetYourGuide, matched to this destination.