Planning for the weather is a good way to make your trip to Ko Ngai relaxing and enjoyable, especially when you’re splurging. The hottest months are usually March and April, with an average temperature of 29°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Ko Ngai are October, May, November and September, with each month seeing an average of 259 mm of rainfall.