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September Weather in Phon Sai, Thailand

Last updated: August 27, 2025

In Phon Sai, Thailand, the average temperature in September hovers around a warm 28°C (83°F). Expect a minimum of 24°C (75°F) and a peak of 35°C (95°F), providing a balmy climate. However, be prepared for some rain, as 303 mm (11.9 in) of precipitation can occur over 24 days. With an average humidity of 89%, the air feels quite tropical.

September Temperature in Phon Sai

In September in Phon Sai, the average temperature is 28°C (83°F). The maximum can reach 35°C (95°F), and the minimum can be as low as 24°C (75°F). This warm and pleasant climate makes it an ideal time for exploring and enjoying outdoor activities in Phon Sai.

September Weather in Phon Sai: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Phon Sai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Phon Sai, September typically has an average temperature of 28°C (83°F), with highs reaching up to 35°C (95°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec767884858585848382817976
Data source: Temperature data for Phon Sai 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 Phon Sai

In Phon Sai in September, the total precipitation amount is 303 mm (11.9 in) over the course of 24 days.

September Precipitation Trends in Phon Sai

The chart displays monthly precipitation patterns in Phon Sai, 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 Phon Sai, September typically receives around 303 mm (11.9 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec5103365159139256253303171338
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Phon Sai

In Phon Sai in September, humidity is 89%. With an average temperature of 28°C (83°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities feel sticky and strenuous, and requiring constant hydration to stay comfortable while exploring.

September Average Humidity in Phon Sai

This chart illustrates the average monthly humidity levels in Phon Sai, 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 Phon Sai is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec56%50%41%44%71%84%87%90%89%83%74%68%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Phon Sai

In Phon Sai 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 Phon Sai.

Maximum UV Index Levels in Phon Sai for September

The chart shows the monthly maximum UV Index (UVI) for Phon Sai 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 Phon Sai typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10131415151314141312109
Data source: Phon Sai 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 Phon Sai Compares to Other Months

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

This table compares monthly weather conditions in Phon Sai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)5 mm (0.2 inches)56%very high
February Weather26°C (78°F)10 mm (0.4 inches)50%extreme
March Weather29°C (84°F)33 mm (1.3 inches)41%extreme
April Weather29°C (85°F)65 mm (2.6 inches)44%extreme
May Weather30°C (85°F)159 mm (6.3 inches)71%extreme
June Weather29°C (85°F)139 mm (5.5 inches)83%extreme
July Weather29°C (84°F)256 mm (10.1 inches)87%extreme
August Weather28°C (83°F)253 mm (10.0 inches)90%extreme
September Weather28°C (83°F)303 mm (11.9 inches)89%extreme
October Weather27°C (81°F)171 mm (6.7 inches)83%extreme
November Weather26°C (80°F)32 mm (1.3 inches)74%very high
December Weather24°C (76°F)8 mm (0.3 inches)68%very high

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