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Incheon, South Korea's third-largest city and its principal port, sits on the Yellow Sea coast just west of Seoul, on a low coastal plain and islands at approximately 37.46°N, 126.71°E. It has a monsoon-influenced humid continental climate (Köppen Dwa) — with cold, dry winters and hot, humid summers — moderated slightly by the sea compared with inland Seoul.
Summer, from June to August, is hot and humid, with August the warmest month — average highs around 29–30°C — tempered a little by sea breezes off the Yellow Sea. The changma, Korea's summer rainy season, brings persistent heavy rain in late June and July, and late summer carries the risk of typhoons sweeping up from the Pacific with torrential rain and strong winds.
Winter, from December to February, is cold and dry, with January the coldest month — average highs around 2°C and lows near -6°C, sharpened by biting northwesterly winds off the continent. The dry Siberian monsoon brings many clear, sunny days, snowfall is light, and the sea keeps the deepest freezes marginally at bay compared with the interior.
Incheon receives around 1,200–1,250 mm of precipitation a year, overwhelmingly concentrated in the summer months from June to September, with the changma rains and typhoons delivering the heaviest falls, while winter is very dry with light snow. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.
Incheon's coastal position gives it slightly milder winters and cooler summers than neighbouring Seoul, along with frequent sea fog over the Yellow Sea in spring and early summer — a recurring hazard for the ferries and for Incheon International Airport. Spring also brings the yellow dust blown across from the Chinese and Mongolian deserts.
To follow any single measurement in Incheon more closely, use our live instruments: the online barometer for atmospheric pressure, the thermometer for temperature, the hygrometer for humidity, the anemometer for wind speed, the wind vane for wind direction, and the rain gauge for rainfall.