Ha Long Bay weather in September 2025

Q: 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.

Q: 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.

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

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

Q: 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.

Q: What is the chance of a cyclone 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.

Expect 88°F 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.

88
88°F max day temperature
6
6 hours of sunshine per day
14
14 days with some rainfall
75
75°F min night temperature
12
12 hours of daylight per day
VH
Very High heat & humidity
8.1
8.1 inches of monthly rainfall
11
11 (Extreme) UV index
84
84°F 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) | Imperial (°F)

More about Vietnam

How hot is it in Ha Long Bay in September?

Daytime temperatures usually reach 88°F in Ha Long Bay in September with very high heat and humidity, falling to 75°F 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 84°F.

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 8.1 inches.

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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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Vietnam - quick facts
Flight time^✝	15 hours
Time difference	UK +7 hours
Language(s)	Vietnamese
Currency	Vietnamese Dong
Electricity	A + B + C plug (220V)
Driving side	Right
Visa^✝	Yes
Why visit?	Beaches Culture Nature Nightlife
Tourist info	Vietnam National Administration of Tourism