Seoul, South Korea – Climate and Average Weather Year Round: A Comprehensive Overview

Seoul, located in the northern hemisphere, experiences a temperate climate with four distinct seasons.

The hottest month of the year in Seoul is August, with an average high of 84°F and a low of 73°F.

During the cold season, which lasts from November to February, temperatures drop significantly.

January sees the coldest weather, with average lows of 22°F and highs of 34°F.

In the spring and fall, Seoul’s weather is mild and pleasant, making these seasons ideal for outdoor activities and family outings.

Summer is warm to hot and often muggy, while winter is cold and occasionally snowy.

Koreans often enjoy skiing during the winter months, thanks to the mountainous regions surrounding the city.

The annual precipitation in Seoul averages 2.33 inches per month, with humidity levels typically around 69%.

These weather patterns make Seoul a city of contrasts, with each season offering unique experiences and activities for residents and visitors alike.

To dive deeper, explore detailed climate information for Seoul.

Average Temperature in Seoul, South Korea

In Seoul, the temperatures throughout the year show a wide range:

• January: 21°F to 34°F
• February: 24°F to 42°F
• March: 34°F to 53°F
• April: 45°F to 65°F
• May: 55°F to 75°F
• June: 64°F to 81°F
• July: 72°F to 85°F
• August: 71°F to 85°F
• September: 62°F to 78°F
• October: 50°F to 66°F
• November: 37°F to 52°F
• December: 23°F to 39°F

Seoul experiences both hot summers and cold winters.

Summer Temperatures

The summer months, particularly June, July, and August, are known for their warmth and humidity.

Daytime temperatures can reach up to 85°F, making it quite hot. These months tend to have high levels of precipitation.

Winter Temperatures

In contrast, winter months like January and December can be freezing, with temperatures often dropping to 21°F.

Snowfall is common during these months.

Annual Temperature Range

Seoul has an annual daytime temperature ranging from a chilly 21°F in January to a warm 85°F in August.

The temperature variations provide distinct seasonal changes, with the maximum Fahrenheit recorded typically in the summer months and the minimum Fahrenheit seen in winter.

Temperature Trends by Month

Here’s a brief look into monthly temperature data:

| Month      | Min Temp (°F) | Max Temp (°F) |
|------------|----------------|---------------|
| January    | 21             | 34            |
| February   | 24             | 42            |
| March      | 34             | 53            |
| April      | 45             | 65            |
| May        | 55             | 75            |
| June       | 64             | 81            |
| July       | 72             | 85            |
| August     | 71             | 85            |
| September  | 62             | 78            |
| October    | 50             | 66            |
| November   | 37             | 52            |
| December   | 23             | 39            |

For further temperature-related information, you can explore an in-depth article on temperature.

Average Precipitation in Seoul, South Korea

Seoul experiences varied precipitation throughout the year, with significant rainfall during the summer months and snowfall in winter.

Average Rainfall in Seoul, South Korea

Seoul’s annual rainfall is approximately 54 inches. This rainfall is unevenly distributed, with the summer months experiencing most of the precipitation.

The rainy season, known as “jangma,” usually occurs from June to September. During these months, the city can receive up to 60% of its total rainfall.

Due to the intense monsoon season, Seoul’s summers are both hot and humid. The heavier rain can sometimes lead to flooding in low-lying areas.

Average Snow in Seoul, South Korea

Seoul receives its fair share of snow during the winter months, primarily from December through February.

On average, the city records about 26 inches of snowfall annually.

Snowfall can be both light and heavy, affecting daily life and transportation.

Schools may close, and public transport can be delayed. The snow often creates beautiful winter scenes, making the city picturesque during this season.

Average Sun in Seoul, South Korea

Seoul experiences varying amounts of sunshine throughout the year, with the sunniest months typically being from May to August. Winter months witness reduced sunlight, affecting both temperature and daily activities.

Average Daily Shortwave Solar Energy in Seoul, South Korea

In terms of shortwave solar energy, Seoul enjoys longer and brighter days during the summer months.

June, July, and August get the most sunlight, contributing to warmer temperatures and lively outdoor activities. On average, these months receive more than 5 kilowatt-hours per square meter per day (kWh/m²/day).

In January and December, the city sees the least sun energy, typically below 3 kWh/m²/day. This reduced solar energy can lead to shorter and dimmer days.

These figures show how Seoul enjoys a substantial increase in sunlight during the middle of the year, especially in the summer.

Average Humidity in Seoul, South Korea

Seoul experiences varying levels of humidity throughout the year.

Humidity is highest during the summer months, making the air feel hotter than it actually is.

Monthly Average Humidity:

During July and August, the humidity levels peak, often reaching around 78%. This high humidity, combined with warm temperatures, can make it feel especially muggy.

In contrast, the winter months like January and February are much drier, with average humidity levels around 57%.

This drier air can make the cold feel more biting.

Seoul’s spring and autumn seasons have moderate humidity levels, providing a comfortable climate for outdoor activities.

For example, April and May have humidity levels around 62-67%, making it more pleasant compared to the humid summer.

Understanding these humidity patterns can help in planning visits or daily activities.

For up-to-date and detailed information, you may refer to the climate averages on Weather Spark’s website and Time and Date.

Average Wind in Seoul, South Korea

Seoul has varying wind speeds through the year. On average, the wind speed is around 5 mph.

Monthly Averages:

The peak wind speeds occur during the winter months. January and February experience some of the highest wind speeds, often reaching around 6.5 mph.

In contrast, the summer months, especially July and August, tend to be calmer. Wind speeds drop to about 3.6 mph, making these months less windy but more humid.

Wind Direction:

The prevailing wind direction is usually from the northwest during the winter. The summer months see a shift, with winds coming from the southeast due to the monsoon season.

Seasonal variations affect not only temperature and humidity but also wind.

For more detailed articles on wind, you can explore more wind-related information. This can provide insights into wind patterns and their effects.

Average Air Quality in Seoul, South Korea

Seoul’s air quality varies throughout the year. The city often experiences fluctuations due to weather patterns and industrial activities. The most common pollutants are fine dust particulate matter (PM2.5) and larger particulate matter (PM10).

Air Quality Index (AQI) Levels:

• Good (0-50): Minimal impact on health. Outdoor activities are safe.
• Moderate (51-100): Acceptable for most, but sensitive individuals may experience mild effects.

Monthly Average AQI Levels:

According to IQAir, the AQI for Seoul often shows “Good” levels, particularly in mid-2020 with an AQI of 50 and PM2.5 concentration at 12 µg/m³.

People with respiratory issues should be cautious during higher pollutant months. For real-time updates, visit AccuWeather.

During times of higher pollution, it’s advisable to stay indoors and limit outdoor activities.

Topography of Seoul, South Korea

Seoul, the capital of South Korea, is surrounded by mountains. The city sprawls across hills and plains divided by the Han River, which flows through the center.

To the north, Bukhansan National Park offers rugged terrain and scenic views. Bukhansan Mountain itself is a popular hiking destination, reaching a peak height of about 2,744 feet.

On the eastern side, Gwanaksan rises up to 1,950 feet. This mountain offers numerous trails with varying levels of difficulty, making it a hotspot for outdoor enthusiasts.

The southern regions of Seoul include Namhansan Mountain. Namhansan provides a combination of historical sites and natural beauty, climbing up to 1,680 feet.

Seoul’s western boundary features Dobongsan Mountain, part of Bukhansan National Park. This area is known for its steep slopes and rocky outcrops, reaching up to 2,425 feet.

In the center of Seoul, Namsan Mountain stands at 860 feet. This mountain is well-known for the N Seoul Tower, which offers panoramic views of the cityscape.

These varying elevations influence both the microclimates and urban planning within the city. In winter, temperatures can drop significantly on higher elevations, adding to the city’s climatic diversity.

Extreme Weather Events that Occur in Seoul, South Korea

Seoul, South Korea, experiences a range of extreme weather events throughout the year. These events can impact daily life and safety, so understanding them is important.

Winters

Winter in Seoul can be quite harsh, with temperatures often dropping below freezing. Average daily temperatures in January are around 27°F. Snowfall is also common, averaging about 10 inches per winter season.

Typhoons

Typhoons can affect Seoul, usually between July and September. These storms bring heavy rain and strong winds, which can lead to flooding and damage to structures. In recent years, such events have caused significant disruptions and evacuations.

Heavy Showers

Summer months, especially July and August, are marked by heavy showers. Rainfall during this period can exceed 12 inches in a month, sometimes leading to flash floods. This year, these intense rains resulted in significant flooding across the region.

Winter Weather

The winter weather in Seoul is known for being extremely cold. Besides snowfall, icy conditions are common, making travel difficult. The wind chill can make it feel even colder than the actual temperature.

General Harsh Conditions

Seoul’s weather can swing from one extreme to another. The city deals with harsh winter temperatures and summer’s heavy rainfalls. Preparedness for these conditions is essential. The recent flooding highlighted the need for better infrastructure to handle extreme weather.

Best Time of the Year to Visit Seoul, South Korea

Seoul experiences distinct seasons, which can affect travel plans and experiences. Spring and fall offer mild weather, while summer brings heat and humidity, and winter can be quite cold.

What is Seoul, South Korea Like in Spring

Spring in Seoul spans from March to May. This season is characterized by mild temperatures, ranging from 45°F to 70°F. Cherry blossoms and other flowers are in full bloom, making it a visually stunning time to visit. Festivals such as the Yeouido Cherry Blossom Festival are popular. There is less rainfall compared to the summer months, making outdoor activities enjoyable.

What is Seoul, South Korea Like in Summer

Summer in Seoul lasts from June to August. This period is hot and humid, with temperatures often exceeding 85°F. July and August experience monsoon rains, with heavy downpours that can last all day. Despite the heat, Seoul offers plenty of indoor activities, such as visiting museums and experiencing the city’s unique cafe culture. Seollal, or Lunar New Year, might still be felt in June.

What is Seoul, South Korea Like in Fall

Fall runs from September to November and offers some of the best weather for visiting Seoul.

Temperatures range from 50°F to 75°F, ideal for outdoor activities and sightseeing.

The foliage turns vibrant shades of orange and red, creating picturesque landscapes.

Fall festivals and events are common, and there’s less rainfall compared to summer, contributing to pleasant travel conditions.

What is Seoul, South Korea Like in Winter

Winter in Seoul is from December to February, marked by cold temperatures and occasional snow.

January is the coldest month, with temperatures often dropping below 20°F.

The city is less crowded, and there’s a unique charm to winter activities like ice skating and visiting heated spas.

Seollal, the Lunar New Year, is an important celebration, featuring traditional festivities and gatherings.