Planning for the weather is a good way to make your trip to Sacheon relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 23°C, while the coldest months are January and December, with an average of 4°C. The rainiest months in Sacheon are July, August, September and June, with each month seeing an average of 245 mm of rainfall.