Bangkok has a tropical climate, meaning it is steadily warm and humid throughout the year and prone to rain. The best time to visit Bangkok is November to February which is known as the ‘cool season’. While it’s still warm during the ‘cool season’ with average temperatures of 28⁰C, these are the driest months in Bangkok with only some typical sporadic shows expected and pleasant conditions for city sightseeing and combining with Phuket, Khao Lak and Krabi on the west coast. From March to June, temperatures rise to average highs of 34⁰C and the heat combined with the intense humidity can be too much for some.
The start of the south-west monsoon season in May brings more frequent showers which can provide temporary relief from the heat. Lasting until October, the monsoon season usually means humid weather with an average temperature of 30⁰C and heavy showers. If you don’t mind the rain, there are great offers to enjoy during Thailand’s low season and far fewer crowds. By October, the rain will begin to subside but can still be unpredictable.
January is one of the best, and most popular, months to visit Bangkok. There are around eight hours of sunshine with clear skies and the weather is mostly dry (though there’s always the chance of rain in a tropical climate). Being the ‘cool season’, temperatures are warm at an average of between 25⁰C and 34⁰C. Humidity won’t feel as high either so it’s a great time to go sightseeing before combining with other destinations in Thailand.
February is another great month in Bangkok and is similar to January, with more pleasant weather and temperatures around 25-34⁰C. We recommended visiting now while it’s still comfortably warm as temperatures begin to rise in March.
Bangkok begins its hot season in March. Days will start to feel particularly humid and temperatures average around 30⁰C. With rising temperatures and considerably dry weather throughout the country, this is a great month to combine Bangkok with some sunbathing on the beach either in the Gulf of Thailand (Koh Samui and Koh Phangan) or the Andaman Coast (Phuket and Khao Lak).
April is typically the hottest month in Bangkok. There’s eight hours of sunshine and it will feel humid with more rain expected – around 110mm in the month. It’s recommended to keep well hydrated as days can get sweltering with highs of 37⁰C.
The Thai New Year, Songkran, is a three-day national celebration in April, most notably marked by the huge street water fights – a welcome refreshment from the scorching heat.
May is another hot month in Bangkok. As the start of the rainy season, it is wetter than April with an average of 180mm of rain. May continues to be intensely humid and average temperatures fall between 27⁰C and 35⁰C. The beginning of Thailand’s low season brings plenty of great offers and fewer crowds, so a short stopover in Bangkok can be combined with sunshine and little rain on east coast islands like Koh Samui.
Bangkok in June is rainy and humid with similar conditions to May. There are six hours of sunshine and 180mm of rainfall. Days feel hot with average highs of 33⁰C and there are still good-value offers to take up. Islands in the Gulf of Thailand like Koh Samui still have hot and mostly dry weather if you’re mainly after a beach break during the school holidays.
In July, Bangkok is rainy and humid with a slight drop in temperature and five hours of sunshine. Showers are likely but often come in short, sharp downpours, with periods of rain getting longer as you approach August. Beaches on the east coast still have good weather in July if you’re combining Bangkok with Koh Samui or Koh Phangan.
There’s plenty of humidity and rain in Bangkok in August. It’s the middle of the wet season, so rainfall can be expected throughout the month both in light spells and heavy downpours. Bangkok welcomes tourists throughout the year and the wet season is still a good time for a leisurely stopover, especially as the tropical rain more often falls in bursts rather than all day. If you don’t mind the weather, you can make the most of your hotel’s facilities spa with a massage or do some shopping in one of Bangkok’s modern shopping centres.
Bangkok in September is usually the wettest month of the year with 220mm of rainfall. Temperatures are still warm at 29⁰C and while Bangkok’s attractions are always busy, the crowds are considerably smaller thanks to the inclement weather.
October marks the end of the wet season in Bangkok. There’s a strong risk of rain throughout the month although the weather is more unpredictable. Each day can bring anything from bright blue skies to grey clouds and torrential rain. For those who don’t mind chancing the weather, there’ll be plenty of great-value accommodation as the low season ends.
Bangkok in November is noticeably drier at the start of the cool season. There’s just 40mm of rainfall and an average temperature of 28⁰C. It’s a great time to visit Bangkok as there’s eight hours of sunshine and generally skies are clear and bright. If you’re looking for a city and beach multi-centre, Khao Lak and Phuket off the Andaman Coast are also starting their dry season so there are fewer showers and warm weather of around 29⁰C.
December is another excellent month to visit Bangkok. There are nine hours of sunshine and minimal rainfall at 10mm. You can expect great weather throughout most of Thailand, making it a great and popular time to visit most of the country, particularly Northern Thailand, Phuket, Khao Lak and Krabi.