Ha Long Bay weather in September 2025

Expect 31°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Ha Long Bay in September. Check more long-term weather averages for Ha Long Bay in September before you book your next holiday to Vietnam in 2025/2026.

  • 31°C maximum daytime temperature in September in Ha Long Bay31
    31°C max day temperature
  • 6 hours of sunshine per day
  • 14 days with some rainfall in September in Ha Long Bay14
    14 days with some rainfall
  • 24°C minimum night-time temperature in September in Ha Long Bay24
    24°C min night temperature
  • 12 hours of daylight per day in September in Ha Long Bay12
    12 hours of daylight per day
  • Very high heat & humidity in September in Ha Long BayVH
    Very High heat & humidity
  • 206 mm monthly rainfall in September in Ha Long Bay206
    206 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in September in Ha Long Bay11
    11 (Extreme) UV index
  • 29°C sea temperature in September in Ha Long Bay29
    29°C sea temperature

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The September 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 September?

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

How sunny is it in Ha Long Bay in September?

There are normally 6 hours of bright sunshine each day in Ha Long Bay in September - that's 51% of daylight hours.

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

The average sea temperature around Ha Long Bay in September is 29°C.

Does it rain in Ha Long Bay in September?

There are usually 14 days with some rain in Ha Long Bay in September and the average monthly rainfall is 206mm.

What is the chance of a typhoon in Ha Long Bay in September?

On average 2.4 days in September in Ha Long Bay are likely to be affected by the passage of one or more tropical storms.

Ha Long Bay September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:36 18:08
Monday, 15th September 2025 05:39 17:55
Tuesday, 30th September 2025 05:43 17:41

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