A destination wedding in Koh Samui would more often than not take place on the island’s sugary white sands, so it is imperative that you have the weather on your side on your big day. Therefore, it goes without saying that getting the timing just right isn’t voluntary, it is absolutely crucial. The rainy season in Koh Samui typically starts in May and lasts through September, with occasional heavy showers. So, presumably, it is the time of the year that you would not want to host your wedding. The weather from December through February is just wonderful, but it is also the peak tourist season in the Thai island, which means that both crowds and prices are at their highest. The shoulder season from October to November makes for a good compromise, dodging both heightened charges and throngs of people.