Weather Trends in Seoul, South KoreaWeather Trends in Seoul,
South Korea

Seoul is defined by a continental climate that produces a dramatic difference between the seasons, characterized by frigid winters and sweltering summers. WeatherBox data shows that the average daily temperature swings by 28.7°C (51.7°F) throughout the year, creating distinct environmental phases. During the colder months, the average daily temperature drops to -1.2°C (29.8°F), while the warmer season sees averages rise to 24.2°C (75.6°F). This intense variation results in a weather profile where conditions shift from deep freezes to tropical-style heat depending on the time of year.

The summer months bring the heaviest rainfall and most oppressive humidity. In July, which is typically the wettest month, precipitation averages 327 mm (13 in), coinciding with a relative humidity level of 82.2. This muggy atmosphere accompanies average daily highs of 29.6°C (85.3°F) in August, though the heat can spike, as temperatures rarely exceed 33.3°C (91.9°F). Conversely, the winter season is characterized by bone-dry air and significantly less precipitation, with January averages falling to just 21 mm (1 in), creating a crisp, cold environment.

Beyond temperature and rain, clear skies are most common in late spring, with May typically offering an average of 261.2 of sunshine. Wind conditions are generally moderate, with prevailing currents blowing from the NW, though gusts rarely exceed 25.4 km/h (15.8 mph). When the sun is strongest, the average peak UV Index is 6.0, indicating a moderate risk of exposure during clear days. For a deeper dive into these seasonal patterns and to see exactly how these metrics change month-by-month, explore the advanced weather charts available on WeatherBox.