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September Weather in Bac Ai, Vietnam

Last updated: August 28, 2025

In September, the average temperature in Bac Ai, Vietnam hovers around 28°C (83°F), with a comfortable minimum of 24°C (75°F) and a peak that can reach 36°C (98°F). Expect 221 mm (8.7 in) of precipitation spread over 24 days, coupled with an average humidity level of 87%. Embrace the warm, tropical climate!

September Temperature in Bac Ai

In September in Bac Ai, the average temperature is 28°C (83°F). Maximums can reach 36°C (98°F) and minimums can be as low as 24°C (75°F). This warm weather makes Bac Ai an ideal destination for travelers looking to enjoy a comfortable climate.

September Weather in Bac Ai: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Bac Ai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bac Ai, September typically has an average temperature of 28°C (83°F), with highs reaching up to 36°C (98°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec767680828485848482817977
Data source: Temperature data for Bac Ai 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 Bac Ai

In Bac Ai in September, the precipitation amount is 221 mm (8.7 in), occurring over the course of 24 days.

September Precipitation Trends in Bac Ai

The chart displays monthly precipitation patterns in Bac Ai, 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 Bac Ai, September typically receives around 221 mm (8.7 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec5917274814288106127221241272116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bac Ai

In Bac Ai in September humidity is 87%. With an average temperature of 28°C (83°F), this humidity feels like you're enveloped in a warm, sticky blanket, making outdoor activities slightly uncomfortable and travel plans require frequent breaks for hydration and respite from the heat.

September Average Humidity in Bac Ai

This chart illustrates the average monthly humidity levels in Bac Ai, 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 Bac Ai is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%79%78%76%78%84%86%87%87%86%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bac Ai

In Bac Ai 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 Bac Ai.

Maximum UV Index Levels in Bac Ai for September

The chart shows the monthly maximum UV Index (UVI) for Bac Ai 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 Bac Ai typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec111416151514141515131210
Data source: Bac Ai 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 Bac Ai Compares to Other Months

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

This table compares monthly weather conditions in Bac Ai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather24°C (76°F)59 mm (2.3 inches)82%extreme
February Weather25°C (77°F)17 mm (0.7 inches)79%extreme
March Weather26°C (80°F)26 mm (1.0 inches)78%extreme
April Weather28°C (82°F)48 mm (1.9 inches)76%extreme
May Weather29°C (84°F)142 mm (5.6 inches)78%extreme
June Weather29°C (85°F)88 mm (3.5 inches)84%extreme
July Weather29°C (85°F)106 mm (4.2 inches)86%extreme
August Weather29°C (85°F)127 mm (5.0 inches)87%extreme
September Weather28°C (83°F)221 mm (8.7 inches)87%extreme
October Weather27°C (81°F)241 mm (9.5 inches)86%extreme
November Weather26°C (79°F)272 mm (10.7 inches)89%extreme
December Weather25°C (77°F)116 mm (4.6 inches)88%very high

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