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 26.7°C (80.1°F) to 29.4°C (84.9°F). 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 -6.1°C (21°F) to -2.8°C (27°F) range, and often dropping to -17.8°C (-0°F). 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% during the year. The annual precipitation is abundant to the tune of 1447.8mm (57"), 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 39.6°C (103.3°F), while the record lowest temperature is -23.1°C (-9.6°F).
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The best times to visit Seoul are from April to May during the spring and September to October during 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 101.6mm (4") 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 during 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 -6.1°C (21°F) to 1.7°C (35.1°F) range. Weather in January »

The average temperatures are in the -3.3°C (26.1°F) to 4.4°C (39.9°F) range as the city sees cloudy skies and light precipitation. Weather in February »

March is mostly cold and damp in Seoul with average temperatures in the 1.7°C (35.1°F) to 10.6°C (51.1°F) range. Weather in March »

The average temperatures are in the warm range of 7.8°C (46°F) to 35.6°C (96.1°F) and the daylight increases to 13 hours. Weather in April »

The average temperatures are in the 13.3°C (55.9°F) to 22.8°C (73°F) range as the humidity increases to about 75%. Weather in May »

The average temperatures are in the comfortable 18.3°C (64.9°F) to 27.2°C (81°F) range, but the increase in humidity to 68% ups the heat quotient. 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. Weather in July »

August withstands the worst of the wet monsoon weather in Seoul with heavy rain and overcast skies. Weather in August »

September is moderately wet and cloudy in Seoul as the rain tapers down to register around 170.2mm (6.7"). Weather in September »

The average temperatures are in the 10.6°C (51.1°F) to 20°C (68°F) range, and the conditions are pleasant in the absence of high humidity, rain, and heat. Weather in October »

The days are bright and clear days as the average temperatures range between 3.3°C (37.9°F) to 11.1°C (52°F). 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. Weather in December »