Seoul experiences a humid continental climate with four distinct seasons, each bringing dramatic shifts in temperature and wardrobe requirements.

The summer monsoon season from late June through August delivers heavy rainfall and oppressive humidity, making waterproof gear and quick-drying fabrics essential.

Temperatures swing from winter lows around -6°C to summer highs exceeding 30°C, demanding everything from heavy insulation to minimal coverage across the year.

Strong winds sweeping down from Siberia in winter make the cold feel significantly more biting than the thermometer suggests, while summer humidity makes heat indices climb well above actual temperatures.

The city's excellent heated indoor spaces and aggressive air conditioning mean layering strategies matter as much for indoor-outdoor transitions as for the weather itself.