Monsoon by Country
Thailand
| Month | Monsoon Description |
|---|---|
| January | January is one of the best months of the year to travel to Thailand, with favorable weather conditions throughout the country. In fact it is one of the most popular months for tourists arriving from all over the world. Northern Thailand tends to be cool and dry and nighttime temperatures in the far north can be a bit chilly. In Bangkok the weather is warmer and drier, with temperatures hovering around 20-23°C throughout the month. |
| February | February. In much of northern Thailand such as Chiang Mai or Chiang Rai the weather is likely to be cool and dry, with little chance of rain. These favorable weather conditions make February an ideal month for outdoor activities up north and provide a break from the heat further south. In Bangkok the atmosphere is drier still and temperatures are warmer than in the north due to the lower altitude. |
| March | In March the temperature starts to rise throughout Thailand and it is especially noticeable in Chiang Mai and the rest of the north of the country where the coolness disappears and gives way to summer. During this month the temperature can reach 35°C during the day and there is little chance of rain. |
| April | Unless you love the heat, avoid Thailand in April. This is the hottest month of the year in the entire country, and the weather is sweltering, especially for travelers who are not well acclimated to these temperatures. The intense heat and humidity in Thailand with the monsoon approaching is exhausting, so if you have no choice but to come in April, look for air-conditioned accommodation... |
| May | May. Much awaited by locals, the month of May brings the monsoon and the oppressive heat of the previous month dissipates. Although for tourists it is not so pleasant, do not despair because the rainy season in Thailand is not synonymous with gray days but heavy rains that last for a while and in a few minutes give way to the sun again. |
| June | June is very wet and the southwest monsoon moves into the center of the country. Temperatures drop slightly due to thunderstorms during the afternoons and evenings and the sun shines most of the time when it is not raining. On the positive side, the water transforms the landscape and makes the countryside green and the rivers flowing. Watch out for flash floods and leeches. |
| July | July is a month of heavy rains, although the sun is out and the heat is back. The Andaman coast is especially humid, but you'll still have a chance to come back from the trip with a tan. This is the best time to see the waterfalls in all their splendor. Watch out for landslides and flash floods. The sea can be rough on the west coast of Thailand. |
| August | Rainfall is at its heaviest in August, with northeastern Thailand experiencing the most pronounced rainfall. Some places such as Bangkok and Trat province experience flooding throughout the month. |
| September | September. The gulf coast islands, such as Koh Samui, Koh Phangan and Koh Tao, are the best destinations for a Thailand vacation in September, being drier and cooler than the rest of the country. Although this does not mean that these islands are completely spared from the monsoon. Central Thailand and Bangkok suffer the worst rains during September, and the Andaman coast is extremely wet with rough seas. |
| October | October. It still rains in Thailand's islands and southern coastal regions in October, but the monsoon begins to withdraw from the central, northern and northeastern areas of the country. In Bangkok and central Thailand, October still brings some rainfall, but its frequency, duration and volume decreases dramatically, particularly in the second half of the month, when the wind begins to change direction. Similarly, the rain retreats from the north, which enjoys moderate temperatures. It is a pleasant time to spend a vacation in this area, especially for hiking. |
| November | By November, the rain has virtually disappeared from much of Thailand, especially at the end of the month. Humidity disappears and temperatures remain relatively low (by Thai standards). November is a good time of year to visit Chiang Mai, Chiang Rai and northern Thailand, the region enjoys sunny, predominantly dry days and pleasant temperatures conducive to outdoor activities, although be aware that nighttime temperatures in the north can be a bit chilly. |
| December | December is one of the best months of the year to travel to Thailand: virtually no rain, pleasant temperatures and plenty of sunshine without being sweltering. Low humidity levels and an average temperature of 26°C in central Thailand and Bangkok are ideal for tourism. The north of the country also enjoys favorable climatic conditions for hiking in the Golden Triangle region and through the Chiang Mai countryside, with slightly cooler temperatures than in Bangkok (average temperature: 23-25°C). |
Festivals & events
Bangkok's Yaowarat Chinatown and Phuket light up; expect crowds and higher prices. Lunar dates, late Jan–Feb.
First day of the Chinese lunar year: the second new moon after the winter solstice, always between 21 January and 20 February.
Next date: 6–7 Feb 2027
Three days of flower floats and parades in Chiang Mai, first weekend of February.
Nationwide water-fight new year (13–15 Apr). Transport and hotels fill up; many businesses close for days.
Rocket festival across Isan praying for rain before planting, boisterous in Yasothon. Usually May.
Nine days of Taoist rites and street processions in Phuket. Lunar dates, usually late September–October.
The first nine days of the 9th Chinese lunar month, which begins with the new moon of late September or October.
Next date: 10–18 Oct 2026
(approx., may be a day off)
Festival of floating lights and sky lanterns, spectacular in Chiang Mai. Dates follow the lunar calendar.
Full moon of the 12th month of the Thai lunar calendar, between late October and late November. Yi Peng in Chiang Mai is that night and the one before.
Next date: 23–24 Nov 2026
(approx., may be a day off)
