Climate Insights for Busan

The climate in Busan is temperate. The average annual temperature is 16°C and approximately 1443mm of precipitation falls per year. Busan receives a notable amount of rainfall throughout the year, including during its driest month. Busan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to 4°C.

Temperatures in Busan vary considerably across the year, with a 24°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 27°C. January is the coolest month, with minimum temperatures around 4°C and an average of 6°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between November and December, with a 6°C shift in average temperatures.

Busan is a fairly wet location, receiving approximately 1443mm of precipitation annually, which averages out to around 120mm per month. The wettest month is September, averaging 257mm of rainfall. July and August also tend to see above-average precipitation. The driest month is December, with just 39mm. That's 217mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Busan is very windy, with an average annual wind speed of 31km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 34km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in June, with average winds dropping to 27km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 7km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 33km/h in winter, 32km/h in spring, 28km/h in summer, 32km/h in autumn.

It is currently spring in Busan, which began on March 20, 2026. Busan is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 28°C, while the coldest stretch bottoms out in January near 4°C. Summer is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Busan is during October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 95mm per month. By contrast, August can be uncomfortably hot with highs reaching 28°C, while January is the coldest period with lows dropping to 4°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Busan based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.