Busan has a oceanic/humid subtropical climate, classified as Cfa in the Köppen system. The warmest month is August with an average high of 28°C, while the coldest month is January with lows dropping to 0°C. The annual temperature range of 28°C reflects moderate seasonal variation.
The driest month is December with only 3 rain days and 28mm of precipitation. For travellers, December 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 Busan
Based on temperature and rainfall data, the best months to visit Busan are October, April, May. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
In August, Busan experiences average highs of 28°C (82°F) and lows of 24°C (75°F). Expect around 14 rainy days and 9 hours of sunshine per day, with humidity averaging 65%. The 4°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.
Busan typically sees 14 rainy days in August, with total precipitation of around 217mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Busan typically sees 4-6 fewer rain days than August.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Busan in August. Daytime temperatures of 28°C are pleasant, but the evening drop to 24°C means a jacket is essential if you plan to be out after dark. With 14 rainy days, bring a compact umbrella or waterproof jacket for unexpected showers. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
August is a reasonable time to visit Busan. Expect 14 rainy days, so pack a light rain layer for flexibility. Average temperatures of 28°C make outdoor exploration comfortable during the dry periods. With 9 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 Busan in August is 28°C (82°F), and the average low is 24°C (75°F). The mean daily temperature is approximately 26°C (79°F). The day-to-night range of 4°C is narrow, typical of coastal or maritime cities. 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 Busan is generally April. April offers the most sunshine at 10 hours per day and only 8 rainy days. Average temperatures reach 16°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around April gives you the best chance of dry, bright weather.
August is shoulder or low season in Busan, meaning fewer tourists and generally lower prices than peak months. With 9 sunshine hours and 14 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, Busan suits a range of activities thanks to mild temperatures around 28°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 9 hours of sunshine, parks and waterfront walks are particularly enjoyable.