September weather forecast
Phuket, Thailand

Beautiful long tail boats on the white sandy shores of a beach in Phuket, Thailand
Beautiful long tail boats on the white sandy shores of a beach in Phuket, Thailand

Weather in September

September, the first month of the autumn, in Phuket, is also a hot month, with average temperature ranging between max 31.5°C (88.7°F) and min 24.6°C (76.3°F).

Temperature

September and October, with an average high-temperature of 31.5°C (88.7°F), are the coldest months.

Heat index

In September, the average heat index is computed to be an extremely hot 43.4°C (110.1°F). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With 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 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, metabolic differences, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. 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

September and October, with an average relative humidity of 82%, are most humid months in Phuket.

Rainfall

September is the month with the most rainfall in Phuket, Thailand. Rain falls for 23 days and accumulates 361.2mm (14.22") of precipitation.

Sea temperature

In Phuket, the average seawater temperature in September is 29°C (84.2°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In September, the average length of the day in Phuket is 12.2h.

Sunshine

In Phuket, the average sunshine is 4.8h.

UV index

Months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 12 interpret into the following advice:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What are the coldest months in Phuket?

The coldest months in Phuket are September and October, with an average high-temperature of 31.5°C (88.7°F).

What is the temperature in September in Phuket?

In Phuket, in September, the average high-temperature is 31.5°C (88.7°F), and the average low-temperature is 24.6°C (76.3°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in September is computed to be 43.4°C (110.1°F).

What is the most humid month in Phuket?

Months with the highest humidity in Phuket are September and October, with an average relative humidity of 82%.

What is the average humidity in September in Phuket?

The average relative humidity in September is 82%.

What is the wettest month in Phuket?

September is the month with the most rainfall. Rain falls for 23 days and accumulates 361.2mm (14.22") of precipitation.

How much does it rain in Phuket in September?

In Phuket, Thailand, in September, it is raining for 23 days, with typically 361.2mm (14.22") of accumulated precipitation.

How warm is the water in September in Phuket?

In September, the average sea temperature in Phuket, Thailand, is 29°C (84.2°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Phuket have in September?

The average length of the day in September is 12.2h.

How many hours of sunshine does Phuket have in September?

In September, the average sunshine in Phuket, Thailand, is 4.8h.

When is the highest UV index in Phuket?

Months with the highest UV index in Phuket are February through October, with an average maximum UV index of 12.

What is the UV index reading in September in Phuket?

In Phuket, Thailand, the average daily maximum UV index in September is 12. A UV Index reading of 11, and higher, represents an extreme health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Phuket, Thailand

Average temperature in September - Phuket, Thailand
  • Average high temperature in September: 31.5°C

The warmest month (with the highest average high temperature) is March (34°C).
Months with the lowest average high temperature are September and October (31.5°C).

  • Average low temperature in September: 24.6°C

The month with the highest average low temperature is April (25.8°C).
The coldest month (with the lowest average low temperature) is December (24.4°C).

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Average humidity in September
Phuket, Thailand

Average humidity in September - Phuket, Thailand
  • Average humidity in September: 82%

Months with the highest relative humidity are September and October (82%).
The month with the lowest relative humidity is February (69%).

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Average rainfall in September
Phuket, Thailand

Average rainfall in September - Phuket, Thailand
  • Average rainfall in September: 361.2mm

The wettest month (with the highest rainfall) is September (361.2mm).
The driest month (with the least rainfall) is February (23.9mm).

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Average rainfall days in September
Phuket, Thailand

Average rainfall days in September - Phuket, Thailand
  • Average rainfall days in September: 23 days

The month with the highest number of rainy days is September (23 days).
The month with the least rainy days is February (3 days).

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Average sea temperature in September
Phuket, Thailand

Average sea temperature in September - Phuket, Thailand
  • Average sea temperature in September: 29°C

The best months for swimming (with the highest average sea temperature) are April, May and June (30°C).
The coldest months (with the lowest average sea temperature) are January, February and December (28°C).

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Average daylight in September /
Average sunshine in September
Phuket, Thailand

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

The month with the longest days is June (Average daylight: 12.6h).
Months with the shortest days are January and December (Average daylight: 11.7h).

  • Average sunshine in September: 4.8h

The month with the most sunshine is February (Average sunshine: 9.7h).
The month with the least sunshine is June (Average sunshine: 4.7h).

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Average UV index in September
Phuket, Thailand

Average UV index in September - Phuket, Thailand
  • Average UV index in September: 12

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).

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