May · Vietnam
Best time to visit Ha Long Bay in May Weather, crowds & prices
Weather in Ha Long Bay in May
Average temperature 27°C, 246 mm of rain, about 20 days with 6+ hours of sunshine and 85% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
4.2/10
Ranked #8 of 12 months
- Avg temp
- 27°C
- Rainfall
- 246 mm
- Humidity
- 85%
- Days with 6h+ sun
- 20
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
May in Ha Long Bay scores 4.2/10 for nature and wildlife travel - ranked #8 of 12. Expect around 27°C, 246 mm of rain, and roughly 20 days with 6+ hours of sunshine this month.
Ha Long Bay's limestone towers rise from green water, with overnight junks, cave visits, and kayaking among the islands.
May in Ha Long Bay: expect compromises
Days in May average 27°C (80°F) and humidity near 85% — 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 246 mm, but with about 20 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 4.2/10 on the same scale — 8th of 12 months, versus 8/10 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 light for this destination.
If your dates are flexible, November is materially better in Ha Long Bay — 3.8 points higher on the same scale.
Frequently asked
- What is the weather like in Ha Long Bay in May?
- In May, Ha Long Bay averages 27°C, 246 mm of rain, and about 20 days with 6+ hours of sunshine. Its climate-comfort score is 4.2/10.
- Is May a good time to visit Ha Long Bay?
- May earns a 4.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Ha Long Bay in May?
- Expect about 246 mm of rain in May. Average humidity is 85% and there are about 20 days with 6+ hours of sunshine.
Curated in Ha Long Bay
Tickets & experiences
Things to do in Ha Long Bay
Ha Long Bay, Vietnam. Live activities and tours from GetYourGuide, matched to this destination.