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January is the middle of the cool season here - November to February - and the Pattaya forum's description is short: nice, little falling, and generally 25 to 30C. What they add is the cost of that. The same months are high season, so tourist numbers and prices are both up, and anything near Chinese New Year more so again. It is the best weather of the year and the busiest stretch of the year, and the forum treats those as the same fact rather than two. The record: 30.8C days that feel like 34C, 24.2C nights, 6.4 precipitation days, 10.2 hours of sun, a 27C sea - and AQI 102, the number the threads do not mention.

February is one of the two months Pattaya regulars call the coolest, which here means daytime that may not exceed 30C and nights that only fall to about 25 - our row gives 31.5C and 24.9C, reading as 35C once the humidity is counted. It is also among the drier months, though not rainless: 39.5mm falls across 6.4 days, and the forum's own description keeps some daytime rain in it. The direction of travel is the useful part. February and March are the dry pair, but from about the middle of March the temperature starts climbing into genuinely uncomfortable territory and April is the hottest month of the year. November to February is when the visitors come, for exactly this reason. The record: 10.8 hours of sun, a 27.7C sea and AQI 84.

Pattaya-forum threads on March weather describe the tail end of the cooler, drier peak season tipping over into the hot stretch that runs through April: February and March are usually the driest months, but posters note temperatures start climbing noticeably by mid-March, uncomfortable by the back half for some visitors. One trip report specifically called the weather good but too hot, with no rain and no cloud the entire stay. Regulars class March through April as genuinely hot, warmer than the November-through-February window most visitors picture when they think of Pattaya's best season. The record: 32.5C days feeling like a sticky 38C, 26.3C nights, 56mm across 11.7 days, a 28.7C sea, 77 percent humidity and 10.8 hours of sun.

Regulars are direct this counts as the hottest month of Thailand's three seasons, midday temperatures regularly hitting 35-38C with one visitor's own account reaching over 40C poolside. Our row backs that brutally hot, humid read, 33.4C reading as a scorching 40C, over 27.1C nights, with 87.4mm of rain across 13.2 days and humidity at 76 percent. Regulars are consistent that when rain does arrive it's usually a brief but genuinely intense evening thunderstorm rather than an all-day soak. This month also hosts Songkran, Thai New Year, around April 19th, a real cultural highlight alongside the heat that draws its own crowds. The sea sits at a bath-warm 30.6C. The record: 10.8 hours of sun, a 13.6 kph wind and AQI 68.

Forum posters describe a fairly consistent June pattern: rain typically arrives in the late afternoon or evening and rarely lasts more than an hour, with the rest of the day a mix of sun and cloud rather than a washout. Experiences do vary meaningfully year to year, though - one visitor at the end of June described an overcast stretch with frequent downpours, while most posters say the rain isn't enough to meaningfully spoil a holiday. A $1 plastic rain poncho is the standard low-cost backup posters recommend keeping on hand for an unexpectedly cloudy day, treated as cheap insurance rather than a sign to change plans.

November is a switch rather than a month here: the wet southwest monsoon hands over to the drier northeast one, and regulars put the change around the second week, after which the cool dry season runs through to February. Early November can still catch the back end of the rains, though the heavy showers do not last long. Our row is the whole month averaged across that changeover - 84.5mm across 12 days, front-loaded rather than spread evenly. The heat does not ease with it: 31.5C reads as 36C at 77.4 percent humidity, and the nights hold 25.4C. The sea is 29.6C, warmer than the night air. The record: 9.4 hours of sun and AQI 54.

Pattaya's forum calls December close to ideal — warm days, low humidity, little rain, comfortable enough for shorts and a t-shirt day and night. Regulars flag it as a genuine holiday peak too, so Christmas and New Year's week both come with real crowds and higher prices.