Thailand - When to Go & Weather

Climate in Thailand is dominated by tropical monsoons and the weather in Thailand is largely hot and humid across most of the country during the whole year. While Thailand’s seasons are completely divided into the hot season, cool season, and rainy season, in existence it’s approximately hot most of the year. The weather in central, northern, and northeastern Thailand is also known by three seasons, although the southern, coastal regions of Thailand feature only two, making the weather in Thailand easy to understand.

The seasons In Thailand’s domestic provinces are clearly described: Between November and May the weather is mostly dry and the cool season and hot season occur from November to February and March to May.

The other domestic season, the rainy season, beginning from May to November and is influence by the southwest monsoon, during which time rainfall in most of Thailand is at its heaviest.

The coastal region of Thailand in the southern really has only two seasons – rainy season and dry season. Luckily, for those planning a beach holiday, Thailand’s two coasts have a little different rainy seasons, allowing visitors to find sunny beaches nearly year round.

On the west coast the Andaman, where Phuket, Krabi, and the Phi Phi Islands lie, the southwest monsoon brings massive storms from April to October, while on the Gulf of Thailand or east coast, where Koh Samui, Koh Phangan, and Koh Tao lie, the heavy rain falls between September and December.


Cool Season

November – February

Thailand weather in around the central, northern, and northeastern regions is generally cool and dry between November and February; accordingly these are the most popular months to visit Thailand.  Contemplate its location in the tropics however, the Thailand climate is always warm most of the year and genuinely “cool” weather really only occurs in the northern mountains, while areas like Bangkok and Ayutthaya experienced perhaps only two or three weeks of “cool” weather in late December or early January.
The southern region of Thailand really has only two seasons – “rainy” and dry, not technically experiencing “cool” weather, but featuring enjoyable sunshine without unbearable heat, beginning in late November and continuing onto April or May.


Hot Season

March – June

Thailand weather is classified as the hot season lasts from March to June when above temperatures and occasional rain are the average.  Around the domestic areas, including Bangkok and Ayutthaya, this often means hard to endure heat and high humidity.  The temperatures in the hot season begin climbing in February and by April the unrelenting heat makes many residents eager for the upcoming rains, which begin occasionally falling around mid-April.  This is traditionally the least popular season for travelers to visit, although the weather in Thailand is still quite nice along Thailand’s coasts


Rainy Season

July – October

July to October month is the rainy season and is dominated by the southwest monsoon, during this time rainfall in most of Thailand is at its heaviest.  Nevertheless, like the “cool” season, the name “rainy season” is sometimes misleading.  While it absolutely does rain during this season it’s more likely to consist of flash-flood afternoon tremendous pouring of rains than a continual drizzle for days.  If you can stand the heat and humidity, the weather in Thailand is always sunny during the rainy season, but when the rain comes, its fast and it’s extreme.

Generally, the southern parts of Thailand, particularly the Andaman Coast, get the most rain: around 2,400 millimeters every year, Most likely with the central and northern regions of Thailand, both of which get around 1,400 millimeters.


Central Thailand and the East

In mainland Thailand and the eastern provinces, the hot summer weather starts around mid-February and goes on to April. In April, the high temperatures can go up to the 40 degrees centigrade mark. The coldest months are from mid-November to mid-February. There may really be only a few days of cold weather during these months, but the period leading up to the New Year are a welcome from the heat throughout the rest of the year. Even from these days, visitors from Europe still may feel the temperatures as being a little warm during Thailand’s winter, even though not uncomfortably so. The rainy season begins in around May and goes on until October. The rain is frequent and sometimes extreme. For the most part rainstorm goes on for around 30 minutes or so. If you’re going to the beach and destinations in the east (Pattaya, Rayong, Koh Chang), the best time is from December to May.


Northern Thailand and the Northeast

Thailand Northern and the Northeast part have the same seasons as those in the central and eastern regions. The winters are though significantly cooler. Mountainous regions can get very cold, on some occasions down to 0 degrees centigrade. In these parts, winter starts in November and goes on to February. These are the best months for a visit to the North and Northeast flowers are in bloom, it is dry and cool, and in the mountains’ mists and fogs often form making what is already amazing scenery that is absolutely beauty. However, although hot, April is also a great month – during the Songkran Festival people will most likely throw water at you. You will be wet thoroughly that will keep you cool!


Southern Thailand

In Thailand’s Southern part, seasons are less apparent and really there are only two proper seasons – summer and the rainy season. The Gulf of Thailand lies to the east of the Thai island while the Andaman Sea lies to the west. Visiting areas west of the peninsula (Phuket, Phang Nga, and Krabi) is best done between mid-November and April to prevent the monsoons that occur during other months monsoons obviously visiting islands by boat is very difficult and sometimes dangerous. Clearly they are best to be avoided. Areas east of the peninsula (Koh Samui, Hat Yai) are best visited from December to June. However, going the Gulf of Thailand region is possible all year but those going to this region should check the latest weather update to avoid rain. If you are planning in going to both sides of the coast during your stay in Thailand, December to April would be best.

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