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September Weather in Wiang Chai, Thailand

Last updated: August 27, 2025

The average temperature in Wiang Chai, Thailand during September is a warm 28°C (82°F). Expect temperatures to range from a comfortable 21°C (69°F) at minimum to a sizzling 36°C (97°F) at maximum. Be prepared for notable precipitation of 229 mm (9.0 in) over approximately 24 days, accompanied by high humidity levels averaging 83%.

September Temperature in Wiang Chai

In September in Wiang Chai, the average temperature is 28°C (82°F), with a maximum that can reach 36°C (97°F) and a minimum that can drop to as low as 21°C (69°F). This warm climate makes Wiang Chai an ideal destination for travelers seeking pleasant weather and outdoor activities during this time of year.

September Weather in Wiang Chai: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Wiang Chai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wiang Chai, September typically has an average temperature of 28°C (82°F), with highs reaching up to 36°C (97°F) and lows dropping to around 21°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec707380828484838282807669
Data source: Temperature data for Wiang Chai 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 Wiang Chai

In Wiang Chai in September, the precipitation amount is 229 mm (9.0 in) spread over 24 days.

September Precipitation Trends in Wiang Chai

The chart displays monthly precipitation patterns in Wiang Chai, 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 Wiang Chai, September typically receives around 229 mm (9.0 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec321381191282032783542291463123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wiang Chai

In Wiang Chai in September humidity is 83%. With an average temperature of 28°C (82°F), this humidity feels like stepping into a warm, thick blanket, making travel languid and drenched in sweat.

September Average Humidity in Wiang Chai

This chart illustrates the average monthly humidity levels in Wiang Chai, 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 Wiang Chai is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec51%46%38%36%64%81%83%91%83%67%61%56%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Wiang Chai

In Wiang Chai 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 Wiang Chai, you can check here.

Maximum UV Index Levels in Wiang Chai for September

The chart shows the monthly maximum UV Index (UVI) for Wiang Chai 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 Wiang Chai typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec910131314131414141398
Data source: Wiang Chai 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 Wiang Chai Compares to Other Months

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

This table compares monthly weather conditions in Wiang Chai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (70°F)32 mm (1.3 inches)51%very high
February Weather23°C (73°F)13 mm (0.5 inches)46%very high
March Weather27°C (80°F)8 mm (0.3 inches)38%extreme
April Weather28°C (83°F)119 mm (4.7 inches)36%extreme
May Weather29°C (85°F)127 mm (5.0 inches)63%extreme
June Weather29°C (84°F)203 mm (8.0 inches)81%extreme
July Weather28°C (83°F)278 mm (10.9 inches)83%extreme
August Weather28°C (82°F)354 mm (13.9 inches)91%extreme
September Weather28°C (82°F)229 mm (9.0 inches)83%extreme
October Weather26°C (80°F)146 mm (5.8 inches)67%extreme
November Weather24°C (76°F)31 mm (1.2 inches)60%very high
December Weather21°C (70°F)23 mm (0.9 inches)56%very high

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