Trying to figure out the peak season in Koh Samui is a little difficult as it isn’t based on the weather. From April to October is the perfect time to travel due to the weather, but you’ll find accommodation as per your choice varies dramatically from one week to the next. Koh Samui instead focuses their peak seasons on happening events and school holidays, hotels rates around Easter are extremely expensive, but then a few days later will be extremely cheap again. Your best bet is to decide on a couple of dates you’d be comfortable travelling and then doing any research to see if there are any events, school holidays or bank holidays which would affect the cost of things. Try to avoid Christmas and New Years’ unless you have your flight tickets and hotel room secured well in advance.

May is generally the most pleasant time to visit. Temperatures aren’t too humid and hot but the rain is also a much rarer occurrence. You might struggle to find the cheapest flights to Koh Samui in May however as a lot of tourists to visit the island then.