Temperatures throughout Thailand in April can be summed up in one word – hot – with average temperatures in the high 30°C’s a frequent occurrence.
The heat in Bangkok and central Thailand (around Kanchanaburi) can be particularly oppressive, making sightseeing hard work, so plan for shorter experiences rather than all-day visits.
To avoid the heat, head south, where temperatures are slightly cooler (avg temp: 29-34°C). The east coast beaches are the pick of the bunch in April, with rain showers expected on the west coast beaches of Phuket, Khao Lak and Krabi, especially as the month progresses. The east coast also enjoys more favourable dive conditions than the west coast this month, with good underwater visibility and the possibility of spotting whale sharks around Koh Tao and Koh Samui.