If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Bucheon: The hottest months are usually August and July, with an average temperature of 24°C, while the coldest months are January and December, with an average of 1°C. The rainiest months in Bucheon are July, August, September and June, with each month seeing an average of 233 mm of rainfall.