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September Weather in Hoai An, Vietnam

Last updated: August 28, 2025

In September, the average temperature in Hoai An, Vietnam hovers around 28°C (83°F). However, temperatures can range from a minimum of 24°C (75°F) to a sizzling 36°C (97°F). Expect some moisture, as 214 mm (8.4 in) of precipitation graces the area over 24 days, contributing to an average humidity level of 88%.

September Temperature in Hoai An

In September in Hoai An, the average temperature is 28°C (83°F). The maximum can reach 36°C (97°F), while the minimum can drop as low as 24°C (75°F). Overall, it's a warm month, perfect for beach outings and outdoor adventures.

September Weather in Hoai An: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Hoai An, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hoai An, September typically has an average temperature of 28°C (83°F), with highs reaching up to 36°C (97°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec737478818486858583807774
Data source: Temperature data for Hoai An 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 Hoai An

In Hoai An in September, the precipitation amount is 214 mm (8.4 in) spread over 24 days.

September Precipitation Trends in Hoai An

The chart displays monthly precipitation patterns in Hoai An, 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 Hoai An, September typically receives around 214 mm (8.4 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec8044396413284107128215349442239
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hoai An

In Hoai An in September, humidity is 88%. With an average temperature of 28°C (83°F), this humidity feels like stepping into a warm, dense mist that clings to your skin, making outdoor activities noticeably more taxing and promoting a sense of sluggishness that can hinder your travel plans.

September Average Humidity in Hoai An

This chart illustrates the average monthly humidity levels in Hoai An, 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 Hoai An 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 Hoai An

In Hoai An 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 Hoai An, you can check here.

Maximum UV Index Levels in Hoai An for September

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

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

This table compares monthly weather conditions in Hoai An, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)80 mm (3.1 inches)86%extreme
February Weather23°C (74°F)44 mm (1.7 inches)83%extreme
March Weather26°C (78°F)39 mm (1.5 inches)78%extreme
April Weather27°C (81°F)64 mm (2.5 inches)75%extreme
May Weather29°C (84°F)132 mm (5.2 inches)80%extreme
June Weather30°C (86°F)84 mm (3.3 inches)85%extreme
July Weather30°C (85°F)107 mm (4.2 inches)85%extreme
August Weather30°C (85°F)127 mm (5.0 inches)87%extreme
September Weather28°C (83°F)214 mm (8.4 inches)88%extreme
October Weather27°C (80°F)349 mm (13.8 inches)90%extreme
November Weather25°C (78°F)442 mm (17.4 inches)91%extreme
December Weather23°C (75°F)239 mm (9.4 inches)89%very high

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