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September Weather in Yen Bai, Vietnam

Last updated: August 28, 2025

In September, the average temperature in Yen Bai, Vietnam is a warm 28°C (83°F), with lows dipping to 22°C (71°F) and highs reaching up to a sizzling 37°C (98°F). Expect 262 mm (10.3 in) of precipitation over approximately 22 days, contributing to an average humidity of 82%. Make sure to stay hydrated and prepared for the tropical climate!

September Temperature in Yen Bai

In September in Yen Bai, the average temperature is 28°C (83°F). Maximums can reach 37°C (98°F) and minimums can drop to as low as 22°C (71°F). This warm climate makes Yen Bai an ideal destination for travelers looking to enjoy sunny weather and outdoor activities.

September Weather in Yen Bai: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Yen Bai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yen Bai, September typically has an average temperature of 28°C (83°F), with highs reaching up to 37°C (98°F) and lows dropping to around 22°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec646572768285858483777264
Data source: Temperature data for Yen Bai 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 Yen Bai

In Yen Bai in September, the precipitation amount is 262 mm (10.3 in) during 22 days, indicating a significant level of moisture within that period.

September Precipitation Trends in Yen Bai

The chart displays monthly precipitation patterns in Yen Bai, 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 Yen Bai, September typically receives around 262 mm (10.3 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec54441001822763433754852622405352
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Yen Bai

In Yen Bai in September, humidity is 82%. With an average temperature of 28°C (83°F), this humidity feels like stepping into a warm, damp embrace, which can make traveling feel heavy and exhausting, as every movement can be met with a sticky veil of moisture that clings to the skin.

September Average Humidity in Yen Bai

This chart illustrates the average monthly humidity levels in Yen Bai, 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 Yen Bai is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%65%57%50%68%79%91%92%82%76%72%68%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Yen Bai

In Yen Bai in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Yen Bai.

Maximum UV Index Levels in Yen Bai for September

The chart shows the monthly maximum UV Index (UVI) for Yen Bai 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 Yen Bai typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec810121213131314131197
Data source: Yen Bai 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 Yen Bai Compares to Other Months

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

This table compares monthly weather conditions in Yen Bai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather18°C (64°F)54 mm (2.1 inches)63%very high
February Weather18°C (65°F)44 mm (1.7 inches)65%very high
March Weather22°C (72°F)100 mm (3.9 inches)57%extreme
April Weather24°C (76°F)182 mm (7.2 inches)50%extreme
May Weather28°C (82°F)276 mm (10.9 inches)68%extreme
June Weather30°C (86°F)343 mm (13.5 inches)79%extreme
July Weather29°C (85°F)375 mm (14.8 inches)91%extreme
August Weather29°C (84°F)485 mm (19.1 inches)92%extreme
September Weather28°C (83°F)262 mm (10.3 inches)82%extreme
October Weather25°C (77°F)239 mm (9.4 inches)76%extreme
November Weather22°C (72°F)53 mm (2.1 inches)72%very high
December Weather18°C (65°F)52 mm (2.0 inches)68%high

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