September weather forecast and climate
Bangkok, Thailand

A beautiful park in spring outside the Wat Ratchanatdaram Temple in the heart of Bangkok, Thailand
A beautiful park in spring outside the Wat Ratchanatdaram Temple in the heart of Bangkok, Thailand
September is the wettest month of the year in Bangkok. With 332.7mm (13.1") of rain and 5 hours of daily sunshine, it rains almost every day, and when it does not, the average humidity of 79% keeps the body sweating.
September average temperatures are between 25°C (77°F) and 32.8°C (91°F), which is hardly a respite, and even the sea temperature is 27.8°C (82°F).
September is the wrong time to visit Bangkok as the stormy weather and heavy rains often cause flooding. Before planning for a vacation, check the weather forecast and whether the hotel lies in a flood-prone area.

What is the temperature in September in Bangkok?

In September, in Bangkok, the average high-temperature is 32.8°C (91°F), and the average low-temperature is 25°C (77°F).

What is the most humid month in Bangkok?

September is the most humid month, with an average relative humidity of 79%.

What is the average humidity in September in Bangkok?

In Bangkok, the average relative humidity in September is 79%.

How much does it rain in Bangkok in September?

In Bangkok, during September, the rain falls for 21 days and regularly aggregates up to 334.3mm (13.2") of precipitation.

What is the rainiest month in Bangkok?

September is the month with the most rainfall in Bangkok, Thailand. Rain falls for 21 days and accumulates 334.3mm (13.2") of precipitation.

What is the sea water temperature in September in Bangkok?

In September, the average sea temperature in Bangkok is 28.8°C (83.8°F). 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.

What is the average length of the day in September in Bangkok?

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

What is the month with the least sunshine in Bangkok?

Months with the least sunshine are August and September, with an average of 5.2h of sunshine.

How many hours of sunshine does Bangkok have in September?

In Bangkok, the average sunshine in September is 5.2h.

When is the highest UV index in Bangkok?

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

How high is the UV index in September in Bangkok?

In September, the average daily maximum UV index in Bangkok is 12. A UV Index of 11, and more, symbolizes an ultimate hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Bangkok, Thailand
  • Average high temperature in September: 32.8°C

The warmest month (with the highest average high temperature) is April (35.4°C).
The month with the lowest average high temperature is December (31.7°C).

  • Average low temperature in September: 25°C

The month with the highest average low temperature is April (26.9°C).
The coldest month (with the lowest average low temperature) is December (22°C).

Average humidity in September - Bangkok, Thailand
  • Average humidity in September: 79%

The month with the highest relative humidity is September (79%).
The month with the lowest relative humidity is December (66%).

Average rainfall in September - Bangkok, Thailand
  • Average rainfall in September: 334.3mm

The wettest month (with the highest rainfall) is September (334.3mm).
The driest month (with the lowest rainfall) is December (6.3mm).

Average rainfall days in September - Bangkok, Thailand
  • Average rainfall days in September: 21 days

The month with the highest number of rainy days is September (21 days).
Months with the lowest number of rainy days are January and December (1 days).

Average sea temperature in September - Bangkok, Thailand
  • Average sea temperature in September: 28.8°C

The best month for swimming (with the highest average sea temperature) is May (29.9°C).
The coldest month (with the lowest average sea temperature) is January (26.7°C).

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

The month with the longest days is June (Average daylight: 12.9h).
The month with shortest days is December (Average daylight: 11.3h).

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

Months with the highest UV index are February, March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 9).

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