– South Korea has four distinct seasons. Spring is warm and pleasant while summer is short, humid and hot. Autumn is cool, dry and pleasant while winter is long, dry and cold. Seoul’s average temperature in January is -5 degrees Celsius to – 2.5° Celsius (23°- 27,5° Fahrenheit) and in July the average temperature is about 22.5° C to 25° C (71°- 75° Fahrenheit).