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The best time to visit Bangkok is November to February, when the city is cooler and drier at 25°C to 32°C.
Bangkok works in any month though, because most of it is indoors: malls, markets, temples, rooftop bars, and a metro that gets you between them. March to May is the hottest stretch, with Songkran in mid-April. June to October brings short afternoon showers and the lowest rates of the year.
It is also the best base for day trips. Ayutthaya and Pattaya are both an easy drive away.
| Month | High/Low (°C) | Rain |
|---|---|---|
| January | 34°/ 24° | 0 days |
| February | 35°/ 24° | 1 days |
| March | 36°/ 26° | 1 days |
| April | 36°/ 27° | 8 days |
| May | 36°/ 27° | 14 days |
| June | 34°/ 27° | 10 days |
| July | 34°/ 25° | 16 days |
| August | 31°/ 25° | 25 days |
| September | 32°/ 24° | 22 days |
| October | 34°/ 25° | 25 days |
| November | 34°/ 24° | 3 days |
| December | 33°/ 22° | 0 days |
Songkran runs 13 to 15 April every year, and it is a city-wide water fight. Khao San Road, Silom and RCA are the epicentres, and nobody is exempt: expect to be soaked from the moment you step outside.
It falls in the hottest week of the year, which is the point. Book two to three months ahead, keep your phone in a dry bag, and do not plan anything that needs you to stay presentable. Many small shops close for the three days.
Temples before ten, malls and markets in the afternoon, rooftops and river after dark. That rhythm works in every month, and in March to May it is the difference between enjoying the city and enduring it.
The Grand Palace and Wat Pho open early and fill by mid-morning. Chatuchak weekend market is best before eleven. The Chao Phraya river boats are at their best in the last hour of light.
Ayutthaya is about ninety minutes north and best November to February. The ruins are open sun with no shade, so start at opening in any month and avoid April, when it is the hottest place in the itinerary.
Pattaya is about two hours southeast and shares Bangkok's calendar, best November to March. The floating markets at Damnoen Saduak and Amphawa are early-morning trips year-round.