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September Weather in Chiang Muan, Thailand

Last updated: August 27, 2025

In September, the average temperature in Chiang Muan, Thailand hovers around 27°C (80°F), with a minimum of 21°C (70°F) and a maximum of 34°C (94°F). Expect significant rainfall during this period, with total precipitation reaching 235 mm (9.3 in) over approximately 26 days. You’ll also experience high humidity levels, averaging around 85%, adding to the tropical feel of the season.

September Temperature in Chiang Muan

In September in Chiang Muan, the average temperature is 27°C (80°F). Maximum can reach 34°C (94°F) and minimum can be as low as 21°C (70°F). This makes it an ideal destination for travelers seeking warm and pleasant weather.

September Weather in Chiang Muan: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Chiang Muan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chiang Muan, September typically has an average temperature of 27°C (80°F), with highs reaching up to 34°C (94°F) and lows dropping to around 21°C (70°F).
JanFebMarAprMayJunJulAugSepOctNovDec717481828282818080797670
Data source: Temperature data for Chiang Muan 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 Chiang Muan

In Chiang Muan in September, the total precipitation amount is 235 mm (9.3 in) spread across 26 days.

September Precipitation Trends in Chiang Muan

The chart displays monthly precipitation patterns in Chiang Muan, 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 Chiang Muan, September typically receives around 235 mm (9.3 inches) of precipitation spread over approximately 26 days.
JanFebMarAprMayJunJulAugSepOctNovDec281371301492223003352351492518
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chiang Muan

In Chiang Muan in September, humidity is 85%. With an average temperature of 27°C (80°F), this humidity feels like a warm blanket wrapped around you, making travel feel sticky and heavy, but also inviting you to seek out refreshing drinks and cool shade.

September Average Humidity in Chiang Muan

This chart illustrates the average monthly humidity levels in Chiang Muan, 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 Chiang Muan is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec57%53%45%39%66%79%90%92%85%72%64%60%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chiang Muan

In Chiang Muan 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 Chiang Muan, you can check here.

Maximum UV Index Levels in Chiang Muan for September

The chart shows the monthly maximum UV Index (UVI) for Chiang Muan 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 Chiang Muan typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9101313141314141413108
Data source: Chiang Muan 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 Chiang Muan Compares to Other Months

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

This table compares monthly weather conditions in Chiang Muan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather22°C (72°F)27 mm (1.1 inches)57%very high
February Weather24°C (75°F)13 mm (0.5 inches)53%very high
March Weather27°C (81°F)7 mm (0.3 inches)45%extreme
April Weather28°C (83°F)130 mm (5.1 inches)39%extreme
May Weather28°C (83°F)149 mm (5.9 inches)66%extreme
June Weather28°C (82°F)222 mm (8.7 inches)79%extreme
July Weather27°C (81°F)300 mm (11.8 inches)90%extreme
August Weather27°C (80°F)335 mm (13.2 inches)92%extreme
September Weather27°C (80°F)235 mm (9.3 inches)85%extreme
October Weather26°C (79°F)149 mm (5.9 inches)72%extreme
November Weather24°C (76°F)25 mm (1.0 inches)64%very high
December Weather21°C (71°F)18 mm (0.7 inches)60%very high

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