September Weather in Ko Yao, Thailand

Last updated: August 27, 2025

In September, the average temperature in Ko Yao, Thailand hovers around 27°C (81°F). Expect a minimum of 25°C (78°F) and a maximum of 29°C (85°F), offering a pleasant climate. However, be prepared for precipitation totaling 309 mm (12.2 in) over 25 days, with an average humidity of a sultry 84%.

September Temperature in Ko Yao

In September in Ko Yao, the average temperature is 27°C (81°F), with maximums reaching up to 29°C (85°F) and minimums dipping as low as 25°C (78°F). This pleasant weather makes it an ideal destination for travelers looking to enjoy a warm climate.

September Weather in Ko Yao: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Ko Yao, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ko Yao, September typically has an average temperature of 27°C (81°F), with highs reaching up to 29°C (85°F) and lows dropping to around 25°C (78°F).

Data source: Temperature data for Ko Yao generated using information from the Copernicus Climate Change Service.

September Precipitation in Ko Yao

In Ko Yao in September, the total precipitation amount is 309 mm (12.2 in) over the course of 25 days.

September Precipitation Trends in Ko Yao

The chart displays monthly precipitation patterns in Ko Yao, 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 Ko Yao, September typically receives around 309 mm (12.2 inches) of precipitation spread over approximately 25 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Ko Yao

In Ko Yao in September humidity is 84%. With an average temperature of 27°C (81°F), this humidity feels like walking through a warm, moist blanket, making travel uncomfortable and sticky, as every step seems to weigh you down with the heavy air.

September Average Humidity in Ko Yao

This chart illustrates the average monthly humidity levels in Ko Yao, 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 Ko Yao is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ko Yao

In Ko Yao 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 Ko Yao, you can check here.

Maximum UV Index Levels in Ko Yao for September

The chart shows the monthly maximum UV Index (UVI) for Ko Yao 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 Ko Yao typically reaches 14, which falls under the extreme exposure category.

Data source: Ko Yao 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 Ko Yao Compares to Other Months

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

This table compares monthly weather conditions in Ko Yao, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (81°F)	111 mm (4.4 inches)	76%	extreme
February Weather	27°C (82°F)	13 mm (0.5 inches)	73%	extreme
March Weather	28°C (83°F)	38 mm (1.5 inches)	74%	extreme
April Weather	28°C (83°F)	166 mm (6.6 inches)	71%	extreme
May Weather	28°C (83°F)	267 mm (10.5 inches)	72%	extreme
June Weather	28°C (83°F)	275 mm (10.8 inches)	79%	extreme
July Weather	28°C (83°F)	237 mm (9.3 inches)	79%	extreme
August Weather	28°C (82°F)	265 mm (10.4 inches)	82%	extreme
September Weather	27°C (81°F)	309 mm (12.2 inches)	84%	extreme
October Weather	27°C (81°F)	319 mm (12.6 inches)	83%	extreme
November Weather	27°C (81°F)	199 mm (7.8 inches)	84%	extreme
December Weather	27°C (80°F)	124 mm (4.9 inches)	84%	extreme