July · Vietnam
Best time to visit Cat Ba Island in July Weather, crowds & prices
Weather in Cat Ba Island in July
Average temperature 29°C, 338 mm of rain, about 22 days with 6+ hours of sunshine and 86% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
July score
3.8/10
Ranked #9 of 12 months
- Avg temp
- 29°C
- Rainfall
- 338 mm
- Humidity
- 86%
- Days with 6h+ sun
- 22
- Crowd Density
- Moderate Crowds
- Average Expenses
- $ · Budget Friendly ($)
July in Cat Ba Island scores 3.8/10 for nature and wildlife travel - ranked #9 of 12. Expect around 29°C, 338 mm of rain, and roughly 22 days with 6+ hours of sunshine this month.
Largest island in Halong/Lan Ha Bay featuring rainforest national parks, bioluminescent plankton, and kayaking.
July in Cat Ba Island — the hardest end of the year
Days in July average 29°C (84°F) and humidity near 86% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 338 mm, but with about 22 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 3.8/10 on the same scale — 9th of 12 months, versus 7.9/10 for the best month here.
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.
Budget for low-season pricing, and crowds are moderate.
If your dates are flexible, November is materially better in Cat Ba Island — 4.1 points higher on the same scale.
Frequently asked
- What is the weather like in Cat Ba Island in July?
- In July, Cat Ba Island averages 29°C, 338 mm of rain, and about 22 days with 6+ hours of sunshine. Its climate-comfort score is 3.8/10.
- Is July a good time to visit Cat Ba Island?
- July earns a 3.8/10 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 July?
- Expect about 338 mm of rain in July. Average humidity is 86% and there are about 22 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.