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September Weather in Halong, Indonesia

Last updated: August 23, 2025

In Halong, Indonesia, the average temperature in September hovers around 26°C (79°F), creating a comfortable atmosphere for outdoor activities. Expect a minimum of 19°C (67°F) and highs reaching up to 35°C (96°F). However, be prepared for some rain, as precipitation averages 142 mm (5.6 in) over 18 days, contributing to a high average humidity of 77%.

September Temperature in Halong

In September in Halong, the average temperature is 26°C (79°F). Maximum can reach 35°C (96°F) and minimum can be as low as 19°C (67°F). This pleasant climate makes Halong an ideal destination for travelers seeking warm weather and outdoor activities.

September Weather in Halong: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Halong, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Halong, September typically has an average temperature of 26°C (79°F), with highs reaching up to 35°C (96°F) and lows dropping to around 19°C (67°F).
JanFebMarAprMayJunJulAugSepOctNovDec787878797978787879797978
Data source: Temperature data for Halong generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Halong

In Halong in September, the precipitation amount is 142 mm (5.6 in) spread over 18 days.

September Precipitation Trends in Halong

The chart displays monthly precipitation patterns in Halong, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Halong, September typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 18 days.
JanFebMarAprMayJunJulAugSepOctNovDec215212313251212158133119142188270212
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Halong

In Halong in September humidity is 77%. With an average temperature of 26°C (79°F), this humidity feels like walking through a warm, thick fog that clings to your skin, making every step feel heavier and more exhausting while exploring the sights.

September Average Humidity in Halong

This chart illustrates the average monthly humidity levels in Halong, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Halong is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%84%82%80%81%82%82%77%78%77%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Halong

In Halong in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Halong.

Maximum UV Index Levels in Halong for September

The chart shows the monthly maximum UV Index (UVI) for Halong in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Halong typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151616151412121415161414
Data source: Halong September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Halong Compares to Other Months

Weather in Halong varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Halong, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Halong, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (78°F)215 mm (8.5 inches)83%extreme
February Weather26°C (79°F)212 mm (8.4 inches)83%extreme
March Weather26°C (79°F)313 mm (12.3 inches)84%extreme
April Weather26°C (79°F)251 mm (9.9 inches)82%extreme
May Weather26°C (80°F)212 mm (8.3 inches)80%extreme
June Weather26°C (79°F)158 mm (6.2 inches)81%extreme
July Weather25°C (78°F)133 mm (5.2 inches)82%extreme
August Weather26°C (78°F)119 mm (4.7 inches)82%extreme
September Weather26°C (79°F)142 mm (5.6 inches)77%extreme
October Weather26°C (79°F)188 mm (7.4 inches)78%extreme
November Weather26°C (79°F)270 mm (10.6 inches)77%extreme
December Weather26°C (79°F)212 mm (8.3 inches)80%extreme

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