October to February is the dry and cool season in Bangkok, Thailand and the best time to go to Bangkok; the weather is sunny and temperatures hover around 25°C. In March, a very hot inter-season (about 35 °C) begins, which lasts until the end of May with alternating tropical rains. From June, it is the rainy season in Bangkok and it lasts until October, September being to be avoided (heavy rainfall). If you go to Bangkok in April, don't miss the Water Festival, or Songkran, which celebrates the Buddhist New Year, everyone is watering in the streets, laughter guaranteed!