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September Weather in But Son, Vietnam

Last updated: August 28, 2025

In September, the average temperature in But Son, Vietnam reaches a warm 29°C (84°F), with a minimum of 23°C (74°F) and soaring up to a maximum of 37°C (99°F). Be prepared for plenty of rain, as 252 mm (9.9 in) of precipitation typically falls over 21 days, while the average humidity hovers at a sticky 84%.

September Temperature in But Son

In September in But Son, the average temperature is 29°C (84°F). Maximums can reach 37°C (99°F), and minimums can drop to as low as 23°C (74°F). This makes it an ideal time for travelers seeking warm weather and outdoor activities.

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

The chart illustrates September temperature patterns in But Son, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In But Son, September typically has an average temperature of 29°C (84°F), with highs reaching up to 37°C (99°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec666773778489878684787366
Data source: Temperature data for But 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 But Son

In But Son in September, the precipitation amount is 252 mm (9.9 in) spread over 21 days.

September Precipitation Trends in But Son

The chart displays monthly precipitation patterns in But 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 But Son, September typically receives around 252 mm (9.9 inches) of precipitation spread over approximately 21 days.
JanFebMarAprMayJunJulAugSepOctNovDec352142771661093023122522507338
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in But Son

In But Son in September, humidity is 84%. With an average temperature of 29°C (84°F), this humidity feels like a warm blanket enveloping you, making travel sticky and somewhat stifling, yet invigorating, as every step is accompanied by a gentle, humid embrace.

September Average Humidity in But Son

This chart illustrates the average monthly humidity levels in But 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 But Son is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%77%74%70%78%82%90%90%84%81%78%78%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in But Son

In But 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 But Son, you can check here.

Maximum UV Index Levels in But Son for September

The chart shows the monthly maximum UV Index (UVI) for But 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 But Son typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810121313131414141297
Data source: But 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 But Son Compares to Other Months

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

This table compares monthly weather conditions in But Son, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather19°C (66°F)35 mm (1.4 inches)74%very high
February Weather19°C (67°F)21 mm (0.8 inches)77%very high
March Weather23°C (73°F)42 mm (1.7 inches)74%extreme
April Weather25°C (77°F)77 mm (3.0 inches)70%extreme
May Weather29°C (84°F)166 mm (6.5 inches)78%extreme
June Weather32°C (89°F)109 mm (4.3 inches)82%extreme
July Weather31°C (87°F)302 mm (11.9 inches)90%extreme
August Weather30°C (86°F)312 mm (12.3 inches)90%extreme
September Weather29°C (84°F)252 mm (9.9 inches)84%extreme
October Weather25°C (78°F)250 mm (9.8 inches)81%extreme
November Weather23°C (74°F)73 mm (2.9 inches)78%very high
December Weather19°C (67°F)38 mm (1.5 inches)78%high

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