Climate and monthly weather forecast
Seoul, South Korea

The Dongdaemun Gate in Seoul city, South Korea
The Dongdaemun Gate in Seoul city, South Korea

The climate of Seoul

Notably situated within the Köppen climate zone, Seoul, South Korea is characterized by a Humid Continental climate with a twist—this city experiences a severe dry winter and a hot summer, classified as Dwa in the Köppen classification. This geographical location lends itself to vast fluctuations in temperature from extreme cold in winter months to sweltering heat during the summer.

Over the course of a year, the city sees average high temperatures ranging from a frosty 1.5°C (34.7°F) in the first month of the year to a sun-stricken 29.6°C (85.3°F) at the peak of summer in August. Correspondingly, the low temperatures follow a similar pattern, with mercury dipping to -5.9°C (21.4°F) in January and reaching a nighttime high of 22.4°C (72.3°F) in August.

Relative humidity levels follow a distinct annual cycle, with moderate conditions between 56.2% and 78.3%. Rainfall ranges broadly from 21mm (0.83") in January, with no more than 6.5 rainy days, to a flood-inducing 395mm (15.55") over 16.3 days in July. However, the daily sunshine duration and UV index reflect the amount of solar energy reaching the city's surface, both of which peak during the summer months.

The best time to visit Seoul

Considering the sunshine hours, moderate temperature, and relative humidity, the prime time for tourism in Seoul would arguably be from late spring to early summer, specifically from April to June. During this period, high temperatures are comfortably nestled between 10.4°C (50.7°F) and 23°C (73.4°F). Correspondingly, rainfall is moderate compared to the rest of the year, progressing from 47mm (1.85") to 106mm (4.17"), while the number of rainy days ramps up from 7.4 to 9.0.

In addition, these months boast a robust 12 to 14.2 hours of daylight, allowing visitors to make the most of their day. Sunlight exposure is balanced with a UV index between 5 and 8 - not so low to prevent a lovely summer glow, nor too high to expose tourists to harmful ultraviolet radiation.

The worst time to visit Seoul

Avoid July and August if possible when planning a visit to Seoul. These months experience the highest temperatures, peaking between 28.6°C (83.5°F) and 29.6°C (85.3°F). The muggy heat is exacerbated by the relative humidity, which soars to 78.3% and 75.6%, respectively. Last but not least, these momentous deluges bring a washout average of 395mm (15.55") and 364mm (14.33") rainfall in July and August. Coupled with an oppressive UV index of 10 and 9, these factors make Seoul less favorable for outdoor activities.

Spring weather in Seoul

Spring descends between March and May, marking a refreshing escape from the clinging cold of winter. During this period, average high temperatures climb from 10.4°C (50.7°F) to 23°C (73.4°F), making way for the blossoms to flourish. Correspondingly, low temperatures emerge from the freezing mark to a comfortable 13.2°C (55.8°F), pointing to milder nights and early mornings. As much as 47mm (1.85") to 106mm (4.17") rainfall can be expected, providing ample moisture for the blooming season.

Summer weather in Seoul

From June to August, Seoul dives into a sizzling hot summer. The average high temperature flares between 23°C (73.4°F) and 29.6°C (85.3°F), while the minimum temperature floats around 18.2°C (64.8°F) to 22.4°C (72.3°F). However, summer is also the rainiest season in Seoul, with downpours reaching from 133mm (5.24") in June to a staggering 395mm (15.55") in July, dipping slightly to 364mm (14.33") in August. Amidst this, the city grapples with maximum relative humidity and UV index levels, making for steamy days and sticky nights.

Autumn weather in Seoul

September ushers in a pleasant autumn. The season is characterized by gradually receding temperatures from 25.8°C (78.4°F) to a modest 11.6°C (52.9°F) by November. Simultaneously, rainfall decreases from a sizeable 169mm (6.65") in September to a mere 53mm (2.09") by November, marking drier and clear days. Relative humidity and UV index levels also drop, offering a much-needed reprieve after the brutal summer months.

Winter weather in Seoul

From December to February, Seoul is in the icy grip of winter. High temperatures skid down from a chilling 4.3°C (39.7°F) in December to a bone-chilling 1.5°C (34.7°F) in January, before rising marginally in February. The mercury plummets further at night, with lows oscillating from -3.2°C (26.2°F) to -5.9°C (21.4°F). Yet, in the heart of this severe winter, Seoul remains relatively dry and with fewer daylight hours, reducing the likelihood of snowfall.

Weather in January

January in Seoul, South Korea is predominantly dry and consists of long, cold nights with low temperatures descending to -5.9°C (21.4°F). Frozen snowflakes frequently decorate the scenic landscapes, creating a wintry atmosphere. Weather in January »

Weather in February

February displays a continuation of the winter climate, with cold conditions prevailing. Snowfall is still possible, adding to the charm of Seoul's architectural treasures. The Level 2 UV index implies that snow blindness could be an issue for those outside during sunny days. Weather in February »

Weather in March

March acts as a bridge between winter and spring, with temperatures ranging from -3.4°C (25.9°F) to 10.4°C (50.7°F). The soft spring breeze brings a sense of renewal to Seoul, as colorful flowers start blooming around the city. Weather in March »

Weather in April

April witnesses a significant transition towards warm weather, with Seoul's landscapes transforming into vibrant canvases of cherry blossoms. Ideal for outdoor activities, the climate is comfortably warm, experiencing soft, refreshing rain showers. Weather in April »

Weather in May

May is marked by Seoul's rapid transition into summer, with more daylight hours and increasingly warm temperatures. Gardens are in full bloom and street festivals become more frequent and vibrant. Visitors and locals can enjoy outdoor dining and afternoon strolls in parks. Weather in May »

Weather in June

June showcases the arrival of summer in Seoul, with hot, humid, and rainy conditions becoming the norm. People can be seen enjoying ice creams and cold drinks to ward off the heat. Nature enthusiasts will appreciate the lush greenery in parks and along the Han River. Weather in June »

Weather in July

July is mostly characterized by Seoul's hot and humid conditions due to the monsoon season. Raincoats and umbrellas become essential items for residents and tourists alike. Despite the heat, traditional summer celebrations continue with enthusiasm. Weather in July »

Weather in August

August maintains the peak of summer in Seoul, with sultry weather and intense rain showers. It is a typical sight to see locals sipping on cold buckwheat noodles to keep cool. Outdoor enthusiasts will relish in the magnificent sunsets along the Han River despite the high humidity. Weather in August »

Weather in September

September ushers in the autumn spirit as it transitions from the sweltering summer. The city starts radiating hues of gold and brown, marking the beginning of fall. The comfortable autumn days make it a popular month for touring the city's cultural landmarks. Weather in September »

Weather in October

October is famous for offering the best of Seoul’s autumn weather, with mild temperatures and low rainfall. The city boasts vibrant and colorful foliage, offering beautiful panoramas, especially the panoramic view from Namsan Tower. Weather in October »

Weather in November

November, the last month of the autumn in Seoul, is cool month, with an average temperature varying between 11.6°C (52.9°F) and 3.2°C (37.8°F). November's arrival is marked by a significant decrease in the average high-temperature, moving from a comfortable 19.8°C (67.6°F) in October to a cool 11.6°C (52.9°F). Weather in November »

Weather in December

December marks the advent of winter, with temperatures diving into chilly lows. The streets are adorned with warm festive decorations, lighting up Seoul's winter spell. Hot street food serves as the city’s defense against the falling mercury. Weather in December »

Frequently asked questions

What are the coldest months in Seoul?

In Seoul, January is the coldest month, with temperatures averaging a high of 1.5°C (34.7°F) and a low of -5.9°C (21.4°F).

What is the driest month?

January is the month with the least rainfall. Rain falls for 6.5 days and accumulates 21mm (0.83") of precipitation.

How much does it rain?

Throughout the year, there are 108.8 rainfall days, and 1451mm (57.13") of precipitation is accumulated.

What is the month with the lowest UV index?

January and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the least humid month?

April is the least humid month, with an average relative humidity of 56.2%.

What month has the most sunshine?

May has the most sunshine of the year, with an average of 6.9h of sunshine.

When are the longest days?

The month with the longest days is June, with an average of 14h and 42min of daylight.

What is the most humid month?

With an average relative humidity of 78.3%, July is the most humid month.

What is the wettest month?

July is the month with the most rainfall. Rain falls for 16.3 days and accumulates 395mm (15.55") of precipitation.

What is the month with the least sunshine in Seoul?

With an average of 3.9h of sunshine, July has the least sunshine of the year.

What is the month with the highest UV index?

The month with the highest UV index is July, with an average maximum UV index of 10.

What month is the hottest?

The month of August sees the average highest temperatures, reaching 29.6°C (85.3°F) at the peak and 22.4°C (72.3°F) at the low.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 36min of daylight.

Is there Daylight Saving Time (DST)?

Seoul, South Korea, does not utilize Daylight Saving Time (DST). KST timezone is used over the entire year.

Average temperature
Seoul, South Korea

Average temperature - Seoul, South Korea

The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (1.5°C).

The month with the highest average low temperature is August (22.4°C).
The coldest month (with the lowest average low temperature) is January (-5.9°C).

Average humidity
Seoul, South Korea

Average humidity - Seoul, South Korea

The month with the highest relative humidity is July (78.3%).
The month with the lowest relative humidity is April (56.2%).

Average rainfall
Seoul, South Korea

Average rainfall - Seoul, South Korea

The wettest month (with the highest rainfall) is July (394.7mm).
The driest month (with the least rainfall) is January (20.8mm).

Average rainfall days
Seoul, South Korea

Average rainfall days - Seoul, South Korea

The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is February (5.8 days).

Average daylight / Average sunshine
Seoul, South Korea

Average daylight / Average sunshine - Seoul, South Korea

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

The month with the most sunshine is May (Average sunshine: 6h and 54min).
The month with the least sunshine is July (Average sunshine: 3h and 54min).

Seoul, South Korea

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