Planning for the weather is a good way to make your trip to Ko Mook relaxing and enjoyable, especially when you’re splurging. The hottest months are usually March and February, with an average temperature of 29°C, while the coldest months are January and February, with an average of 28°C. The rainiest months in Ko Mook are September, October, August and July, with each month seeing an average of 367 mm of rainfall.