Seoul weather in August

August in Seoul is hot and humid with average highs of 29.2°C (85°F) and lows of 22.4°C (72°F). Expect significant rainfall—around 262mm spread across roughly 15 rainy days—making this the wettest month of the year. Despite frequent showers, you'll still get about 9 hours of sunshine daily. The combination of heat, humidity, and moisture creates a distinctly tropical atmosphere that can feel intense for unprepared visitors.

This is peak summer in Seoul, and the city takes on a quieter character as locals escape to coastal resorts and mountain retreats. Major festivals and outdoor events often pause during August's heat. Tourist crowds remain moderate to high, though fewer international visitors brave the weather compared to spring or autumn. The humidity can make sightseeing challenging during midday hours, but evenings cool slightly and are more pleasant for exploration.

If you're considering Seoul in August 2026, come prepared for wet weather and heat. Pack light, breathable clothing and waterproof gear. Early mornings and late afternoons are ideal for outdoor activities. This month suits travelers who don't mind the weather trade-off and want to experience Seoul's local summer culture, including street food festivals and evening riverside walks.