Bangkok
Thailand
Long-term weather forecast
Long-term weather forecast

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?

The average high-temperature, in September, in Bangkok, Thailand, is 32.8°C (91°F), while the average low-temperature is 25°C (77°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that takes the relative humidity and factores it into the air temperature reading, in September is appraised at 46.9°C (116.4°F).

What is the most humid month in Bangkok?

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

What is the average humidity in September in Bangkok?

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

How much does it rain in Bangkok in September?

In Bangkok, Thailand, in September, it is raining for 21 days, with typically 334.3mm (13.2") of accumulated precipitation.

What is the wettest month in Bangkok?

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

What is the sea water temperature in September in Bangkok?

In Bangkok, the average seawater temperature in September is 28.8°C (83.8°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.

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

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

What is the month with the least sunshine in Bangkok?

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

How long on average sun shines in September in Bangkok?

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

What is the month with the highest UV index in Bangkok?

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

How high is the UV index in September in Bangkok?

In Bangkok, the average daily maximum UV index in September is 12. A UV Index value of 11, and more, symbolizes an extreme health vulnerability from unsafe exposure to the Sun's UV rays.
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).