Busan weather in September
In September, Busan has an average high of 25 °C77 °F and an average low of 20 °C68 °F, with about 175 mm6.9 in of precipitation. It is the 3rd warmest month of the year and ranks 3rd for precipitation.
How September compares with other months
Compared with August, September is 3.7 °C6.7 °F cooler on average and drier by 69 mm2.7 in. Compared with October, September is 5.2 °C9.4 °F warmer on average and wetter by 100 mm4.0 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 82% and the average cloud amount 67%.
Is September a good time to visit Busan?
September is not among the most comfortable months by our comfort score: it is fairly wet (175 mm6.9 in) and it is humid (82%). The most comfortable months in Busan are October.
What to wear in September
For Busan in September, pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Busan | 2577 | 2068 | 1756.9 |
| Gijang | 2476 | 2373 | 1867.3 |
| Yangsan | 2678 | 1763 | 1616.3 |
| Changwon | 2577 | 2067 | 1756.9 |
| Geoje | 2577 | 2068 | 1756.9 |
| Ulsan | 2576 | 2169 | 1686.6 |
| Gyeongju | 2476 | 1967 | 1586.2 |
| Chinju | 2678 | 1865 | 1716.7 |
| Daegu | 2577 | 1661 | 1475.8 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Gijang; cooler: Yangsan and Daegu.
Other months in Busan
- January6 °C43 °F / −1 °C31 °F
- February8 °C47 °F / 1 °C34 °F
- March12 °C54 °F / 4 °C40 °F
- April17 °C62 °F / 9 °C48 °F
- May21 °C70 °F / 14 °C56 °F
- June24 °C75 °F / 18 °C64 °F
- July27 °C80 °F / 22 °C72 °F
- August28 °C83 °F / 24 °C75 °F
- September25 °C77 °F / 20 °C68 °F
- October21 °C69 °F / 14 °C57 °F
- November15 °C58 °F / 7 °C45 °F
- December8 °C46 °F / 1 °C34 °F
Frequently asked questions
How warm is Busan in September?
In September the average high in Busan is 25 °C (77 °F) and the average low is 20 °C (68 °F).
Does it rain a lot in Busan in September?
On average about 175 mm (6.9 in) of precipitation falls in September; it ranks 3rd of the 12 months.
Is September the warmest month in Busan?
No. The warmest month in Busan is August, with an average high of 28 °C (83 °F). The coldest month is January, with an average low of -1 °C (31 °F).
How long is the day in Busan in September?
In the middle of September the day in Busan lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Busan in September?
The average relative humidity in September is about 82%. Combined with warm days, it can feel muggy.
How cloudy is Busan in September?
On average about 67% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 70 m, while Busan lies at about 15 m. Temperatures on this page were therefore adjusted by +0.4 °C0.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.