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Thailand, when to go
When to go to Thailand
Most visitors arrive during Thailand’s dry season, from November through February. The weather during this period is pleasantly warm and sunny, though airline and hotel prices reflect this and are higher than at other times of the year. April and May are usually the hottest months (though Thailand is never cold at any time during the year) when temperatures will be in the low to mid 30°C. May to October is generally considered to be low season as rainfall is high, though there is always sunshine between the downpours. Bear in mind that Thailand’s two most popular resorts, Phuket and Koh Samui, have differing rainy seasons. The best time to go to Phuket (in the west) is from November to March, while Koh Samui (in the Gulf of Thailand), is at its best during June to September.
Bangkok is hot all year round with temperatures averaging around 30-35°C. The best time to visit is between December and January when it’s slightly cooler and drier. The wet season is from May to October, coinciding with the hottest time of the year.

Chiang Mai
Chiang Mai is warm all year round but the coolest period is November to February - temperatures are a maximum of 25°C, with an occasional chill in the mornings. Temperatures rise to a maximum of 40°C during the hottest period from March to June and some visitors may find this period too hot. The wet season lasts from July to October. Downpours and high humidity occur. Rainfall is unpredictable so a few dry days can be followed by a few wet days. Temperatures at this time average 30°C.

Chiang Rai
The best time to visit this region is in winter, from November to February when the air is cool and refreshing and the beautiful flowers are in bloom. The wet season lasts from July to October.

Hua Hin
September through to February is generally the best time to visit Hua Hin, when the skies are clear and it’s less humid. Temperatures don’t vary too greatly throughout the year; usually between 27°C and 35°C. The rainy season is from April to August and, although humid, Hua Hin is not as hot as Bangkok due to the cooling sea breezes wafting off the Gulf of Thailand.

Koh Samui
February to June is the hot and dry season with temperatures touching 40°C. May to September have some short, sharp downpours but are cooler months with temperatures in the mid to late 30°C and calmer seas. The rainy season extends from October through to January.

The dry, coolest period is from November to February and this proves to be the most popular time for visitors. The rainy season from June to October brings a mixture of sunshine and tropical downpours, with spring from March to May offering hot weather (35°C). Generally the temperature throughout the year averages 30°C.

Khao Lak
Khao Lak enjoys warm weather all year round. From November through to March temperatures are around 25-32°C with cool breezes making this one of the most popular periods for visitors. The hottest months are April and May with temperatures reaching 36°C. June to October is the rainy season with brief, but heavy showers mixed with sunshine.

Khao Sok
Khao Sok is one of the wettest areas in Thailand with an average annual rainfall of around 3,500mm. This will generally be restricted between the months of May and November. At other times of the year the area is generally dry apart from the odd day of rain

The ideal time to visit is November to April, the hot and dry season when there are generally calm seas and clear blue skies. The rainy season, from May to October, is cooler but days are punctuated with short sharp downpours. Average temperatures throughout the year vary between 28- 32°C but reach 36°C during March and April.

Phi Phi islands
January and February are probably the best months to visit, but also the busiest with visitors. The rainy season is generally May to October, peaking in September. The rainfall tends to come in short, sharp downpours. Temperatures are fairly consistent throughout the year, 24-32°C

THAILAND AVERAGE MONTHLY TEMPERATURES AND RAINFALL (Temperatures in °Centigrade, Rainfall in millimetres)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  °C R °C R °C R °C R °C R °C R °C R °C R °C R °C R °C R °C R
Bangkok 26 11 28 28 29 31 30 72 30 189 29 152 29 158 28 188 28 320 28 231 27 57 26 9
Chiang Mai 21 8 23 6 26 15 29 45 29 153 28 136 27 167 27 227 27 251 26 132 24 44 22 15
Koh Samui 24 163 25 37 25 50 28 88 27 151 27 76 27 126 27 103 26 102 26 228 26 432 25 227
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