South Korea
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and Climate
Seoul, South Korea

The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
The colorful lit cityscape of Seoul city, South Korea, with the perfect view of the Dongdaemun Gate
Seoul has a humid continental type of climate (Köppen climate classification Dwa) that borders on the humid tropical type (Cwa), with hot, humid and wet summers, and cold and dry winters. Seoul, the capital of South Korea, lies in the northwest part of the country on the shores of the Han River that bisects the city in north and south parts. The city lies in the temperate latitudes to the east of the Yellow Sea, and the East Asian Monsoon has a significant effect on the climate.

Seoul has an average altitude of 38 meters above sea level. The topography consists of eight mountains surrounding the city, numerous hills and the large Han River plain among other features. The strong Siberian winds bring occasional snow and regular frost during the cold season. Typhoons sporadically pass over the region in the storm season from June to September.

Summers are hot and humid in Seoul with the average high temperatures in the 80°F (26.7°C) to 85°F (29.4°C). The monsoon is prominent during the summer and brings around 80% of the annual rainfall. The summer season is also the period of storms, typhoons, and floods. Winters are cold and dry with the average low temperatures in the 21°F (-6.1°C) to 27°F (-2.8°C) range, and often dropping to 0°F (-17.8°C). The spring and autumn seasons are warm and dry with calm weather.

The annual sunshine is around 2066 hours while the average humidity is around 65% in the year. The annual precipitation is abundant to the tune of 57" (1447.8mm), the majority of which occurs during the rainy period of summer. The peak of the monsoon brings heavy rainfall in July and August. Snowfall is sporadic during the peak of winter while frost is more common in the cold months.

The highest temperature on record for Seoul is 103.3°F (39.6°C) while the record lowest temperature is -9.6°F (-23.1°C).


The best times to visit Seoul are from April to May during the spring and September to October in the autumn when the temperatures are relatively mild, and the weather is agreeable. The average temperatures drop below the high levels of summer, and it is comfortably warmer than the winter. The spring and autumn are relatively dry with pleasant weather and bright skies. The seas are calm, and there is less possibility of storms.

The worst times to visit Seoul are in July and August during the peak monsoon, and from December to February in the cold winter.
The East Asian Monsoon lashes the region with severe rainfall during the summer months, and a single day can receive over 4" (101.6mm) of rain. July and August also tend to have stormy weather. The Siberian winds blow forcefully over the Korean Peninsula and bring frost, snow and severe cold in the winter.

Seoul is vulnerable to thunderstorms, typhoons, and floods mainly during the rainy period from June to September. Thunderstorms are common in the region with lightning and heavy rain during the monsoon season. Torrential rains cause flooding during the wet season as the city is at a low elevation and the downpour may last for days. Typhoons from the East and South China Seas from the west and the Sea of Japan from the east occasionally pass over Seoul.

January is the coldest month of the year in Seoul with the average temperatures in the 21°F (-6.1°C) to 35°F (1.7°C) range. The peak of the winter occurs around New Year when the conditions are severely cold, and the temperatures may even touch 0°F (-17.8°C). January is the snowiest month, but the snow is light in Seoul and does not accumulate on the ground. The days are mostly dry while the nights are frosty, especially when the northern gale blows across the city. The skies are dark, and the daily sunshine lasts for around 5 hours in the short days. January is mostly the time to avoid visiting Seoul! Weather in January »

February is cold and dry in Seoul as strong northeasterly winds blow from the Siberian plains. The average temperatures are in the 26°F (-3.3°C) to 40°F (4.4°C) range as the city sees cloudy skies and light precipitation. Winter days are short, and the sunshine hardly lasts for a daily 5 hours. Frost is common during the night while the snowfall if present is usually light. The weather is frequently dry in the absence of a high degree of humidity, and the sun is above the horizon for many days in February in Seoul. Weather in February »

March is mostly cold and damp in Seoul with average temperatures in the 35°F (1.7°C) to 51°F (10.6°C) range. The severe cold reduces with the increase in the daily sunshine up to 6 hours. March receives light snowflakes occasionally in the event of a cold front. The dryness in the air gives way to a little moistness as light rainfall registers to the tune of 1.8" (45.7mm) in the month.
Seoul's location is slightly north of the tropics, but the Siberian winds that pass over the Korean Peninsula keep it cold. Wear warm clothes and expect a little rain in March. Weather in March »

April sees the warmth of spring in Seoul as the sun rises firmly over the horizon. The weather is more agreeable as the cold conditions gradually give way to warm ones. The humidity is the lowest of the year at 56%, and it is the end of snowy days and frosty nights. The average temperatures are in the warm range of 46°F (7.8°C) to 96°F (35.6°C) and the daylight increases to 13 hours. The skies are often clear and calm as the days of blossoming flowers bask in beautiful sunshine. April is one of the best times to visit Seoul with pleasant temperatures and moderate rainfall of 2.5" (63.5mm). Weather in April »

May is damp but equally sunny and cloudy in Seoul as the mercury column" up with every passing day. The average temperatures are in the 56°F (13.3°C) to 73°F (22.8°C) range as the humidity increases to about 75%. The rainfall is around 4.2" (106.7mm) as the region prepares for the onset of the monsoon season. The surrounding hills wear a lush green look, and the weather is enjoyable. The 14-hour days see a daily 7 hours of temperate sunshine. Expect rain and shine in May - carry umbrellas or wear rain jackets while exploring outdoors. Asian Dust sporadically affects plants and animals during spring. Weather in May »

June is the beginning of the monsoon season in Seoul, which brings heavy rainfall and stormy weather. The average temperatures are in the comfortable 65°F (18.3°C) to 81°F (27.2°C) range, but the increase in humidity to 68% ups the heat quotient. The rainfall registers to 5.2" (132.1mm) as the monsoon pick up strength. Summer is usually cloudy and sometimes even foggy as the sunshine reduces to a daily 6 hours even though the days are 15- hour long. Though the skyline is hazy in June in Seoul, the city looks beautiful in the lush green surroundings. Weather in June »

July is the cloudiest, wettest and most and humid month in Seoul as the East Asian Monsoon settles in the Korean Peninsula. It rains heavily, and there are frequent thunderstorms. The downpour may easily exceed 5" (127mm) in a day, during a rainstorm, and the month registers 15.5" (393.7mm). The average humidity crosses 78%, and the heat is stifling as the average temperatures lie in the 71°F (21.7°C) to 84°F (28.9°C) range. Cloudy, dark skies reduce the daily sunshine to less than 4 hours even though the days stretch to 14 hours. Expect heavy rainfall with thunderstorms in July. Weather in July »

August withstands the worst of the wet monsoon weather in Seoul with heavy rain and overcast skies. The daily sunlight is to the tune of 5 hours, and the average temperatures are in the hot 72°F (22.2°C) to 85°F (29.4°C) range. The humidity adds to the feeling of heat as the rainfall crosses 14.3" (363.2mm). August is prone to thunderstorms and typhoons, and almost every day is wet. The summer sun is intense when it breaks the cloud covers during short periods.
August is an avoidable time for visiting Seoul even though there are many indoor attractions to entertain people. Weather in August »

September is moderately wet and cloudy in Seoul as the rain tapers down to register around 6.7" (170.2mm). The average temperatures are between 63°F (17.2°C) and 78°F (25.6°C) with a drop in humidity that sees it below 70%. The conditions improve in comparison with the heat of summer and the wetness of the rainy season. The sunshine improves to 6 hours a day, and the skies remain clear during sunny periods. Seoul is prone to flooding around the rainy season, so check the weather conditions while planning a visit. Weather in September »

October is one of the best times to visit the beautiful city of Seoul with mild temperatures in the promising autumn season. The average temperatures are in the 51°F (10.6°C) to 68°F (20°C) range, and the conditions are pleasant in the absence of high humidity, rain, and heat. The rain hardly registers around 2" (50.8mm) as the sun shines for 198 hours in October. The storms cease substantially as sunny and calm weather chases the clouds from the skies. Tourists crowd in Seoul in October as there is finally a chance to move around the city without umbrellas or raincoats. Weather in October »

November brings the first signs of cold to Seoul with a significant drop in temperatures. The days are bright and clear days as the average temperatures range between 38°F (3.3°C) to 52°F (11.1°C). The departure of the monsoon sees mostly dry winters with a drop in humidity. The days become short, and the average sunshine lasts for a daily 5 hours. A cold front occasionally develops in November that makes the nights chilly. However, the autumn is colorful and breezy, and the weather is agreeable with the aid of warm jackets. Weather in November »

December is cold in Seoul as the winter takes charge of the city. The skies are cloudy at times but also remain clear during long periods of sunshine. The average temperatures are in the 26°F (-3.3°C) to 40°F (4.4°C) range but the cold can be severe, and the temperatures can drop down significantly. The shortest days of the year are around the fourth week of December when the daylight hardly lasts for 10 hours. The winter in Seoul is usually chilly, and the rain is negligible in this period. Warm winter coats go a long way to face the cold. Weather in December »