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May Weather in Sia, Vietnam

Last updated: August 28, 2025

In May, the average temperature in Sia, Vietnam hovers around 29°C (84°F). However, temperatures can swing from a minimum of 21°C (71°F) to a scorching maximum of 37°C (99°F). Expect 175 mm (6.9 in) of precipitation spread over 17 days, contributing to an average humidity level of 73%. Stay prepared for a warm and somewhat humid month!

May Temperature in Sia

In May in Sia, the average temperature is 29°C (84°F), with maximums reaching up to 37°C (99°F) and minimums dropping as low as 21°C (71°F). This makes it an ideal destination for travelers seeking warm and pleasant weather.

May Weather in Sia: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Sia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sia, May typically has an average temperature of 29°C (84°F), with highs reaching up to 37°C (99°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec717277798386868683797672
Data source: Temperature data for Sia 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.

May Precipitation in Sia

In Sia in May, the precipitation amount is 175 mm (6.9 in) occurring over the course of 17 days.

May Precipitation Trends in Sia

The chart displays monthly precipitation patterns in Sia, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Sia, May typically receives around 175 mm (6.9 inches) of precipitation spread over approximately 17 days.
JanFebMarAprMayJunJulAugSepOctNovDec1819681132175146220189274585605351
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Sia

In Sia in May, humidity is 73%. With an average temperature of 29°C (84°F), this humidity feels like a warm blanket wrapped around you, making travel slightly uncomfortable as you sweat and seek shade, yet still inviting you to explore the vibrant local culture and activities.

May Average Humidity in Sia

This chart illustrates the average monthly humidity levels in Sia, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Sia is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%73%64%60%73%82%90%92%87%85%84%83%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Sia

In Sia in May, 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 Sia, you can check here.

Maximum UV Index Levels in Sia for May

The chart shows the monthly maximum UV Index (UVI) for Sia in May, 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 May, the maximum UV index in Sia typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121314141314141312109
Data source: Sia May 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 May Weather in Sia Compares to Other Months

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

This table compares monthly weather conditions in Sia, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (71°F)181 mm (7.1 inches)77%very high
February Weather22°C (72°F)96 mm (3.8 inches)73%extreme
March Weather25°C (77°F)81 mm (3.2 inches)64%extreme
April Weather26°C (80°F)132 mm (5.2 inches)60%extreme
May Weather29°C (84°F)175 mm (6.9 inches)73%extreme
June Weather30°C (87°F)146 mm (5.7 inches)82%extreme
July Weather30°C (86°F)220 mm (8.7 inches)90%extreme
August Weather30°C (86°F)189 mm (7.4 inches)92%extreme
September Weather28°C (83°F)274 mm (10.8 inches)87%extreme
October Weather26°C (80°F)585 mm (23.0 inches)85%extreme
November Weather25°C (76°F)605 mm (23.8 inches)84%very high
December Weather22°C (72°F)351 mm (13.8 inches)83%very high

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