Ha long Bay Weather in September
In Ha long Bay, September brings very high daytime temperatures around 31°C (88°F), with nights cooling to 26°C (79°F). This month falls within the rainy season, so expect frequent rainfall.
Rainfall in Ha long Bay in September
As part of the rainy season, Ha long Bay sees around 14 days of rain in September, with an average of 318 mm (13 in). Rainy season showers here are typically intense, often clearing quickly but coming down hard while they last.
Temperature in Ha long Bay in September
September in Ha long Bay brings typical temperatures with highs around 31°C (88°F) and lows of 26°C (79°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. Nights remain warm at around 26°C (79°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.
Sunshine in Ha long Bay in September
With approximately 190 hours of sunshine, the days are filled with clear skies during the day. Rain typically falls in the afternoon or evening, keeping mornings and early parts of the day sunny.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Ha long Bay. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Vietnam, check out our Ha long Bay's climate page.
Ha long Bay Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
31°C (88°F)
Chance of Rain
47%
Precipitation
318 mm (13 in)
Rainy days
14 days
Humidity
83% *
Sunshine
190 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Ha long Bay typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Ha long Bay in September
Browse day-by-day weather records for Ha long Bay spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Ha long Bay historical weather extremes in September
The extremes listed below come from historical weather data collected in Ha long Bay from 1976 through 2025.
- The warmest day in September was on September 5, 2024, with a maximum of 37°C (99°F).
- The lowest daytime temperature in September was 19°C (66°F), recorded on September 27, 1997.
- Ha long Bay registered its coldest September night on September 27, 1997, with temperatures dropping to 16°C (61°F).
Best Places in Vietnam in September
Find out more about the weather in Vietnam and which places have the best travel conditions in this month. See all of Vietnam in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Ha long Bay in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Ha long Bay in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Vietnam, check out our Ha long Bay's climate page.
Temperature Rainfall Sunshine Humidity
See the full Ha long Bay climate overview or explore weather in Vietnam.
