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September Weather in Khon San, Thailand

Last updated: August 27, 2025

In September, the average temperature in Khon San, Thailand hovers around 27°C (81°F), making it a warm destination. Expect minimum temperatures to dip to 22°C (72°F) and highs soaring up to 34°C (94°F). Notably, this month sees about 211 mm (8.3 in) of precipitation spread over 22 days, coupled with an average humidity of 86%. Embrace the warmth, but don't forget your umbrella!

September Temperature in Khon San

In September in Khon San, the average temperature is 27°C (81°F), with maximums reaching 34°C (94°F) and minimums dipping to 22°C (72°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

September Weather in Khon San: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Khon San, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Khon San, September typically has an average temperature of 27°C (81°F), with highs reaching up to 34°C (94°F) and lows dropping to around 22°C (72°F).
JanFebMarAprMayJunJulAugSepOctNovDec747681838383828281807772
Data source: Temperature data for Khon San 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 Khon San

In Khon San in September, the precipitation amount is 211 mm (8.3 in) distributed over 22 days.

September Precipitation Trends in Khon San

The chart displays monthly precipitation patterns in Khon San, 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 Khon San, September typically receives around 211 mm (8.3 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec7124077160146193185211148218
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Khon San

In Khon San in September, humidity is 86%. With an average temperature of 27°C (81°F), this humidity feels like walking through a steamy blanket, making traveling feel heavy and exhausting as each step absorbs the warm, moist air.

September Average Humidity in Khon San

This chart illustrates the average monthly humidity levels in Khon San, 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 Khon San is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec52%49%39%40%69%81%83%87%86%74%63%57%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Khon San

In Khon San 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 Khon San, you can check here.

Maximum UV Index Levels in Khon San for September

The chart shows the monthly maximum UV Index (UVI) for Khon San 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 Khon San typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9121414141314141413109
Data source: Khon San 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 Khon San Compares to Other Months

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

This table compares monthly weather conditions in Khon San, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)7 mm (0.3 inches)52%very high
February Weather24°C (76°F)12 mm (0.5 inches)49%extreme
March Weather27°C (82°F)40 mm (1.6 inches)39%extreme
April Weather28°C (83°F)77 mm (3.0 inches)40%extreme
May Weather28°C (83°F)160 mm (6.3 inches)69%extreme
June Weather28°C (83°F)146 mm (5.8 inches)81%extreme
July Weather28°C (83°F)193 mm (7.6 inches)83%extreme
August Weather28°C (82°F)185 mm (7.3 inches)87%extreme
September Weather27°C (81°F)211 mm (8.3 inches)86%extreme
October Weather26°C (80°F)148 mm (5.8 inches)74%extreme
November Weather25°C (77°F)21 mm (0.8 inches)63%very high
December Weather22°C (73°F)8 mm (0.3 inches)57%very high

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