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September Weather in Wan Yai, Thailand

Last updated: August 27, 2025

In Wan Yai, Thailand, the average temperature in September hovers around 28°C (82°F), creating a warm and inviting atmosphere. Expect minimum temperatures that may dip to 22°C (72°F) and maximums reaching up to 34°C (94°F). However, be prepared for some rain, as precipitation averages around 258 mm (10.2 in) spread across 23 days. With an average humidity of 86%, the climate can feel quite tropical—ideal for those who revel in warmth!

September Temperature in Wan Yai

In September, in Wan Yai, the average temperature is a warm 28°C (82°F), with maximums reaching up to 34°C (94°F) and minimums dropping to around 22°C (72°F). This makes it an ideal destination for travelers seeking sunny and pleasant weather.

September Weather in Wan Yai: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Wan Yai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wan Yai, September typically has an average temperature of 28°C (82°F), with highs reaching up to 34°C (94°F) and lows dropping to around 22°C (72°F).
JanFebMarAprMayJunJulAugSepOctNovDec737581838484828282807773
Data source: Temperature data for Wan Yai 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 Wan Yai

In Wan Yai in September, the total precipitation amount is 258 mm (10.2 in) spread over the course of 23 days.

September Precipitation Trends in Wan Yai

The chart displays monthly precipitation patterns in Wan Yai, 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 Wan Yai, September typically receives around 258 mm (10.2 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec2113968167187392328258168275
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wan Yai

In Wan Yai in September, humidity is 86%. With an average temperature of 28°C (82°F), this humidity feels like a warm blanket wrapped around you, making travel quite challenging as you navigate the thick, moisture-laden air that can leave you feeling sticky and fatigued.

September Average Humidity in Wan Yai

This chart illustrates the average monthly humidity levels in Wan Yai, 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 Wan Yai is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec59%54%45%40%65%82%90%92%86%80%72%67%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Wan Yai

In Wan Yai 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 Wan Yai, you can check here.

Maximum UV Index Levels in Wan Yai for September

The chart shows the monthly maximum UV Index (UVI) for Wan Yai 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 Wan Yai typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9121415141315141412109
Data source: Wan Yai 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 Wan Yai Compares to Other Months

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

This table compares monthly weather conditions in Wan Yai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)2 mm (0.1 inches)59%very high
February Weather24°C (75°F)11 mm (0.4 inches)54%extreme
March Weather27°C (81°F)39 mm (1.5 inches)45%extreme
April Weather28°C (83°F)68 mm (2.7 inches)40%extreme
May Weather29°C (84°F)167 mm (6.6 inches)65%extreme
June Weather29°C (84°F)187 mm (7.4 inches)82%extreme
July Weather28°C (82°F)392 mm (15.4 inches)90%extreme
August Weather28°C (82°F)328 mm (12.9 inches)92%extreme
September Weather28°C (82°F)258 mm (10.2 inches)86%extreme
October Weather27°C (80°F)168 mm (6.6 inches)80%extreme
November Weather25°C (77°F)27 mm (1.1 inches)72%very high
December Weather23°C (73°F)5 mm (0.2 inches)66%very high

Compare Wan Yai's Climate with Cities Worldwide