Planning for the weather is a good way to make your trip to Po Toi Island relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 29°C, while the coldest months are January and December, with an average of 18°C. The rainiest months in Po Toi Island are August, June, July and May, with each month seeing an average of 335 mm of rainfall.