What type of weather do you like—or hate?  Think carefully, because Seoul has all types in extremes. Summer residents suffer under severe humidity while winters have bitterly cold Siberian winds and snowstorms. 

It is coldest in January and February going to below -10 degrees Celsius at times. Monsoon season is from late June to late July and it can nearly every day with lots of humidity. August is hot and sticky. The best weather is from mid September to mid October when temperatures are mild and the autumn skies don beautiful colors. Spring is also a very nice time to visit the city, especially from mid April to mid June.

<What to Wear When>

January to early March - Thick coat, sweater, muffler, gloves or mittens, and thermal wear

Mid March to mid April - Waterproof jacket, sweater, umbrella

Late April to mid June -  Longsleeve shirt

Mid June to early September - Shortsleeve shirt

Mid September to mid October - Lightweight jacket and longsleeve shirt

Late October to Late November - Jacket, sweater, and muffler

December - Jacket, sweater, muffler, and optional gloves or mittens

The above recommendations are for Seoul. It is warmer in places like Busan, Jeju, and the southern coast. Only younger people tend to wear shorts, but for tourists it is okay (though some sites such as temples may prohibit entrance).

Cherry blossom ("beot-kkot") season is usually from late March to mid April, depending on the region. There are cherry blossom festivals all around the country. In Seoul, most people go to Yeouido to see the 1,400 cherry blossom trees. But be warned that this area gets extremely crowded on the weekends and there is nowhere to park.  

It can start snowing in December, but the heavy snow generally occurs in January and February. The mountains are more likely to have snow first, often starting in early November. In fact, most ski resorts are open from late November until early March. But some ski resorts are opening earlier and ending later, taking advantage of snowmaking machines. For example, Yongpyong Ski Resort's 2012-2013 ski season is expected to be open from November 5 to the first week of April. Often times, you can enjoy snow without leaving the city by visiting a park or mountain like Bukhansan.

The annual, city-sponsored “Hi Seoul Festival” takes place in May, as the capital shows itself off with parades, performing arts, music, tea, and other cultural sources of pride. Otherwise, the majority of cultural events and activities occurring in Seoul revolve around transient museum exhibitions. Be sure to check the city’s official website for these dates if you think the contents of an events calendar would frame your itinerary .