Ha Long Bay weather in May 2025

Expect daytime maximum temperatures of 31°C in Ha Long Bay, Vietnam in May and very high heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with 14 days with some rainfall and typically 168 mm of rainfall in the month.

  • 31°C maximum daytime temperature in May in Ha Long Bay31
    31°C max day temperature
  • 6 hours of sunshine per day
  • 14 days with some rainfall in May in Ha Long Bay14
    14 days with some rainfall
  • 24°C minimum night-time temperature in May in Ha Long Bay24
    24°C min night temperature
  • 13 hours of daylight per day in May in Ha Long Bay13
    13 hours of daylight per day
  • Very high heat & humidity in May in Ha Long BayVH
    Very High heat & humidity
  • 168 mm monthly rainfall in May in Ha Long Bay168
    168 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in Ha Long Bay11
    11+ (Extreme) UV index
  • 27°C sea temperature in May in Ha Long Bay27
    27°C sea temperature

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The May weather guide for Vietnam (Ha Long Bay) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Ha Long Bay in May?

Daytime temperatures usually reach 31°C in Ha Long Bay in May with very high heat and humidity, falling to 24°C at night.

How sunny is it in Ha Long Bay in May?

There are normally 6 hours of bright sunshine each day in Ha Long Bay in May - that's 46% of daylight hours.

How warm is the sea around Ha Long Bay in May?

The average sea temperature around Ha Long Bay in May is 27°C.

Does it rain in Ha Long Bay in May?

There are usually 14 days with some rain in Ha Long Bay in May and the average monthly rainfall is 168mm.

Ha Long Bay May sunrise & sunset times

Browse the sunrise and sunset times for Ha Long Bay in May 2025. Select a month to view Ha Long Bay sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:22 18:17
Friday, 16th May 2025 05:14 18:23
Saturday, 31st May 2025 05:10 18:29

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