Busan weather in September
September in Busan: warm, soaked, with clean air — a good time to visit.
#9 of 12 months in Busan · #459 of 604 destinations to visit in September · comfort 66/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Busan climate normals — September
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 224 mm / 8.8 in | ⛈ soaked |
| Rainy days | 13 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 19°C / 67°F | |
| Sunshine | 7.7 h/day | |
| Daylight | 12.4 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 47 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Busan in September — FAQ
- Is September a good time to visit Busan?
- September in Busan: warm, soaked, with clean air — a good time to visit. It ranks #9 of 12 months for Busan on SeasonMap's comfort score (66/100).
- What is the weather like in Busan in September?
- In September, Busan averages a daily high of 24.9°C and a low of 21°C, with about 224.1 mm of rain over roughly 12.6 rainy days.
- What is the air quality in Busan in September?
- Busan has a mean US Air Quality Index of about 47 in September.