Chiang Mai
Thailand
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Chiang Mai, Thailand

The stunning aerial panorama of the fantastic Two Pagoda on top of the Doi Inthanon mountain in Chiang Mai, Thailand
The stunning aerial panorama of the fantastic Two Pagoda on top of the Doi Inthanon mountain in Chiang Mai, Thailand
Septiembre, the first month of the autumn, in Chiang Mai, is still a hot month, with average temperature ranging between min 23.2°C (73.8°F) and max 31.7°C (89.1°F).

Temperature

In Chiang Mai, the average high-temperature is relatively the same as in Agosto - a still tropical 31.7°C (89.1°F). In Septiembre, the average low-temperature is 23.2°C (73.8°F).

Heat index

The average heat index in Septiembre is evaluated at an extremely hot 43.7°C (110.7°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'apparent temperature', or 'felt air temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, metabolic differences, pregnancy). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

Agosto and Septiembre, with an average relative humidity of 81%, are most humid months.

Rainfall

In Chiang Mai, in Septiembre, during 20 rainfall days, 211.4mm (8.32") of precipitation is typically accumulated. Throughout the year, in Chiang Mai, there are 113 rainfall days, and 1130.6mm (44.51") of precipitation is accumulated.

Daylight

In Septiembre, the average length of the day in Chiang Mai is 12.2h.

Sunshine

Months with the least sunshine in Chiang Mai are Agosto and Septiembre, with an average of 5.2h of sunshine.

UV index

Marzo through Septiembre, 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 ultimate health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 12 transform into the following instructions:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.

What is the temperature in Septiembre in Chiang Mai?

The average high-temperature, in Septiembre, is 31.7°C (89.1°F), while the average low-temperature is 23.2°C (73.8°F). In Septiembre, the average heat index (a.k.a. 'real feel', 'felt air temperature'), that factores the actual air temperature with the relative humidity, is estimated at 43.7°C (110.7°F).

What are the most humid months in Chiang Mai?

Months with the highest humidity in Chiang Mai, Thailand, are Agosto and Septiembre, with an average relative humidity of 81%.

What is the average humidity in Septiembre in Chiang Mai?

In Septiembre, the average relative humidity in Chiang Mai is 81%.

How many days does it rain in Septiembre in Chiang Mai?

In Chiang Mai, Thailand, in Septiembre, it is raining for 20 days, with typically 211.4mm (8.32") of accumulated precipitation.

How many hours of daylight does Chiang Mai have in Septiembre?

In Septiembre, the average length of the day is 12.2h.

What is the month with the least sunshine in Chiang Mai?

Agosto and Septiembre, with an average of 5.2h of sunshine, are months with the least sunshine.

How long on average sun shines in Septiembre in Chiang Mai?

In Septiembre, the average sunshine in Chiang Mai is 5.2h.

When is the highest UV index in Chiang Mai?

Marzo through Septiembre, with an average maximum UV index of 12, are months with the highest UV index in Chiang Mai.

What is the UV index intensity in Septiembre in Chiang Mai?

In Chiang Mai, Thailand, the average daily maximum UV index in Septiembre is 12. A UV Index of 11, and more, symbolizes an excessive health risk from the exposure to the Sun's UV rays.
Average temperature in September - Chiang Mai, Thailand
  • Average high temperature in September: 31.7°C

The warmest month (with the highest average high temperature) is April (36.5°C).
The month with the lowest average high temperature is December (28.6°C).

  • Average low temperature in September: 23.2°C

The month with the highest average low temperature is June (24°C).
The coldest month (with the lowest average low temperature) is January (14.9°C).

Average humidity in September - Chiang Mai, Thailand
  • Average humidity in September: 81%

Months with the highest relative humidity are August and September (81%).
The month with the lowest relative humidity is March (52%).

Average rainfall in September - Chiang Mai, Thailand
  • Average rainfall in September: 211.4mm

The wettest month (with the highest rainfall) is August (216.9mm).
The driest month (with the lowest rainfall) is January (4.2mm).

Average rainfall days in September - Chiang Mai, Thailand
  • Average rainfall days in September: 20 days

The month with the highest number of rainy days is September (20 days).
Months with the lowest number of rainy days are January and December (1 days).

Average daylight in September / Average sunshine in September - Chiang Mai, Thailand
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13.3h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in September: 5.2h

The month with most sunshine is February (Average sunshine: 9h).
Months with least sunshine are August and September (Average sunshine: 5.2).

Average UV index in September - Chiang Mai, 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 8).