Thailand’s climate can be split into three main seasons: rainy – (May – October), cool (November – February), and hot (March – May). If you want predictability when you visit Thailand, then it’s best to avoid visiting during the rainy season, as it’ll rain most everyday without notice, though not much longer than an hour or two. If you want to avoid the extreme heat of the hot season but don’t want the rain of the rainy season, then the cool season will be best, as temperatures, though still hot, don’t generally get any higher than 30°C. If you plan on spending much of your holiday to Thailand on the beach, then the hot season is perfect – with temperatures reaching as high as 35°C in some places.
Contrary to popular belief, Thailand is a pleasure to visit during the rainy season. The heat is still more than good enough for those in search of a tan, the seas are warm, and even in the north temperatures can be stifling. The rain does come and go, but the showers are more often than not brief and the rains clear the air – especially better in cities like Bangkok. The biggest plus though is the fact that the rainy season attracts fewer people so you can often escape the crowds.