Planning for the weather is a good way to make your trip to Geoje relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 24°C, while the coldest months are January and February, with an average of 6°C. The rainiest months in Geoje are July, September, August and June, with each month seeing an average of 244 mm of rainfall.