Seoul has a continental with dry winters climate, classified as Dwa in the Köppen system. The warmest month is August with an average high of 29°C, while the coldest month is January with lows dropping to -7°C. The annual temperature range of 36°C is typical of continental climates with distinct seasons.
The driest month is February with only 4 rain days and 27mm of precipitation. For travellers, February through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 65% to 65% throughout the year.
Best Time to Visit Seoul
Based on temperature and rainfall data, the best months to visit Seoul are October, April, May. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
In August, Seoul experiences average highs of 29°C (84°F) and lows of 22°C (72°F). Expect around 16 rainy days and 8 hours of sunshine per day, with humidity averaging 65%. The 7°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 9, so sun protection is advisable on clear days.
Seoul typically sees 16 rainy days in August, with total precipitation of around 263mm. This is a notably wet period. A waterproof jacket or compact umbrella is essential, and it is worth building indoor alternatives into your daily itinerary for the inevitable rainy stretches. For context, the driest month in Seoul typically sees 4-6 fewer rain days than August.
Pack lightweight, breathable clothing (linen or cotton), a wide-brim sun hat, SPF 50+ sunscreen, and a refillable water bottle for Seoul in August. The 29°C daytime heat demands sun protection during midday hours, typically 11am to 4pm. A compact travel umbrella is also worth packing, as 16 rainy days means afternoon showers are a real possibility. Quick-dry synthetic fabrics are preferable to cotton in 65% humidity.
August is a reasonable time to visit Seoul. Expect 16 rainy days, so pack a light rain layer for flexibility. Average temperatures of 29°C make outdoor exploration comfortable during the dry periods. With 8 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Seoul in August is 29°C (84°F), and the average low is 22°C (72°F). The mean daily temperature is approximately 26°C (78°F). The day-to-night range of 7°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Seoul is generally May. May offers the most sunshine at 10 hours per day and only 8 rainy days. Average temperatures reach 22°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around May gives you the best chance of dry, bright weather.
August is shoulder or low season in Seoul, meaning fewer tourists and generally lower prices than peak months. With 8 sunshine hours and 16 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In August, Seoul suits a range of activities thanks to warm temperatures of 29°C. With frequent rain, indoor activities and covered attractions are a smart choice. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 8 hours of sunshine, parks and waterfront walks are particularly enjoyable.