Seoul Climate & Weather Averages

Climate Insights from Our Writers

“Seoul's data reveals one of Asia's most underappreciated climate stories: four distinct seasons with dramatic swings between extremes. I've tracked the annual temperature range and found that January averages -5°C while August reaches 30°C with 80% humidity — a swing of 35°C that few major cities can match. This creates a city that transforms completely with each season, offering four different experiences depending on when you visit. The spring months of April and May are when Seoul reveals its most beautiful face, with cherry blossoms, warm temperatures around 16°C, and a sense of renewal that pervades the city. The autumn months of September and October are the statistical sweet spot, with temperatures around 18°C, low rainfall, and clear skies that make the city's mountains and parks spectacular. The monsoon season, typically from late June through July, is the period I consistently recommend avoiding. The data shows over 300mm of rain in July alone, combined with high humidity that makes outdoor activities uncomfortable. The winter months are cold but dry, with plenty of sunshine and a stark beauty that transforms the city's palaces and temples into crystalline landscapes. The best time for a visit is clearly September through October, when the weather is most comfortable and the city's outdoor attractions — Gyeongbokgung Palace, Bukchon Hanok Village, Namsan Park — are at their most enjoyable. The cultural calendar peaks in both spring and autumn, with festivals, events, and a vibrant street life that responds to the favorable weather. For travelers, Seoul offers a climate experience that rewards those who plan around the seasons, with each period offering a distinct character that defines the city's mood and activities.”

— Climate & Travel Writer