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.
  • 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: 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: 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: 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: 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: 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: 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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