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September Weather in Bong Son, Vietnam

Last updated: August 28, 2025

In Bong Son, Vietnam, the average temperature in September is a pleasant 27°C (81°F). Expect milder days with minimums around 24°C (75°F), while the heat can peak at 33°C (92°F). However, come prepared for some rain, as 217 mm (8.6 in) of precipitation can occur over 23 days. The air can feel quite humid, with an average humidity level of 88%.

September Temperature in Bong Son

In September in Bong Son, the average temperature is 27°C (81°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 24°C (75°F). This climate makes Bong Son an ideal destination for travelers seeking warm and pleasant weather.

September Weather in Bong Son: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Bong Son, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bong Son, September typically has an average temperature of 27°C (81°F), with highs reaching up to 33°C (92°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec727276788184838481787673
Data source: Temperature data for Bong Son 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 Bong Son

In Bong Son in September, the total precipitation amount is 217 mm (8.6 in) distributed over 23 days.

September Precipitation Trends in Bong Son

The chart displays monthly precipitation patterns in Bong Son, 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 Bong Son, September typically receives around 217 mm (8.6 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec14981517412680108128217446669377
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bong Son

In Bong Son in September, humidity is 88%. With an average temperature of 27°C (81°F), this humidity feels like a warm, thick blanket wrapping around you as you travel, making every step feel more laborious and requiring frequent breaks to cool down and hydrate.

September Average Humidity in Bong Son

This chart illustrates the average monthly humidity levels in Bong Son, 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 Bong Son is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%83%78%75%80%85%85%87%88%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bong Son

In Bong Son in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Bong Son, you can check here.

Maximum UV Index Levels in Bong Son for September

The chart shows the monthly maximum UV Index (UVI) for Bong Son 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 Bong Son typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11131515151315151413119
Data source: Bong Son 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 Bong Son Compares to Other Months

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

This table compares monthly weather conditions in Bong Son, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (72°F)149 mm (5.9 inches)86%extreme
February Weather22°C (72°F)81 mm (3.2 inches)83%extreme
March Weather24°C (76°F)51 mm (2.0 inches)78%extreme
April Weather25°C (78°F)74 mm (2.9 inches)75%extreme
May Weather27°C (82°F)126 mm (5.0 inches)80%extreme
June Weather29°C (84°F)80 mm (3.1 inches)85%extreme
July Weather28°C (84°F)108 mm (4.2 inches)85%extreme
August Weather29°C (84°F)128 mm (5.1 inches)87%extreme
September Weather27°C (81°F)217 mm (8.6 inches)88%extreme
October Weather26°C (79°F)446 mm (17.5 inches)90%extreme
November Weather24°C (76°F)669 mm (26.3 inches)91%extreme
December Weather23°C (73°F)377 mm (14.8 inches)89%very high

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