If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Taebaek: The hottest months are usually August and July, with an average temperature of 20°C, while the coldest months are January and December, with an average of -2°C. The rainiest months in Taebaek are August, July, September and June, with each month seeing an average of 218 mm of rainfall.