September weather forecast and climate
Chiang Rai, Thailand

The White Temple of Wat Rong Khun with a waterfront fishpond in Chiang Rai, Thailand, on a beautiful cloudy day panorama
The White Temple of Wat Rong Khun with a waterfront fishpond in Chiang Rai, Thailand, on a beautiful cloudy day panorama
September, the first month of the autumn, in Chiang Rai, is also a hot month, with temperature in the range of an average high of 31.1°C (88°F) and an average low of 22.7°C (72.9°F).

Temperature

The average high-temperature, in September, is 31.1°C (88°F), while the average low-temperature is 22.7°C (72.9°F).

Humidity

The average relative humidity in Chiang Rai is 83%.

Rainfall

In Chiang Rai, during 18 rainfall days, 283.9mm (11.2") of precipitation is typically accumulated. Throughout the year, there are 137 rainfall days, and 1690.5mm (66.6") of precipitation is accumulated.

Daylight

In Chiang Rai, Thailand, the average length of the day in September is 12.3h.

Sunshine

In Chiang Rai, the average sunshine is 6h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an extreme threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
In September, the average maximum UV index of 12 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.

What is the temperature in September in Chiang Rai?

The average high-temperature, in September, in Chiang Rai, Thailand, is 31.1°C (88°F), while the average low-temperature is 22.7°C (72.9°F).

What is the average humidity in September in Chiang Rai?

The average relative humidity in September in Chiang Rai, Thailand, is 83%.

How many days does it rain in September in Chiang Rai?

In September, in Chiang Rai, the rain falls for 18 days. Throughout September, 283.9mm (11.2") of precipitation is accumulated.

What is the average length of the day in September in Chiang Rai?

In September, the average length of the day in Chiang Rai is 12.3h.

How long on average sun shines in September in Chiang Rai?

The average sunshine in September in Chiang Rai, Thailand, is 6h.

When is the highest UV index in Chiang Rai?

Months with the highest UV index in Chiang Rai are March through September, with an average maximum UV index of 12.

What is the UV index intensity in September in Chiang Rai?

In September, the average daily maximum UV index in Chiang Rai, Thailand, is 12. A UV Index of 11, and more, symbolizes an excessive health risk from unsafe exposure to the Sun's UV rays.
Average temperature in September - Chiang Rai, Thailand
  • Average high temperature in September: 31.1°C

The warmest month (with the highest average high temperature) is April (34.8°C).
The month with the lowest average high temperature is December (27.2°C).

  • Average low temperature in September: 22.7°C

The month with the highest average low temperature is June (23.6°C).
The coldest month (with the lowest average low temperature) is January (12.8°C).

Average humidity in September - Chiang Rai, Thailand
  • Average humidity in September: 83%

The month with the highest relative humidity is August (84%).
The month with the lowest relative humidity is March (62%).

Average rainfall in September - Chiang Rai, Thailand
  • Average rainfall in September: 283.9mm

The wettest month (with the highest rainfall) is August (358.4mm).
The driest month (with the lowest rainfall) is January (7.5mm).

Average rainfall days in September - Chiang Rai, Thailand
  • Average rainfall days in September: 18 days

The month with the highest number of rainy days is August (24 days).
The month with the lowest number of rainy days is February (1 days).

Average daylight in September / Average sunshine in September - Chiang Rai, Thailand
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.3h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in September: 6h

The month with most sunshine is February (Average sunshine: 9h).
Months with least sunshine are June, July and August (Average sunshine: 5).

Average UV index in September - Chiang Rai, Thailand
  • Average UV index in September: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).

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