Monthly climate guide
Busan weather in September
Expect warm weather in Busan in September: afternoons reach about 25°C (76°F), while nights drop to around 19°C (67°F). Around 197 mm of rain falls over the month (very wet), and skies are often cloudy. Daytime highs are 4°C cooler than August and 5°C warmer than October.
What stands out in September
- In Busan, September is early autumn.
- September is Busan's third warmest month.
- It's wetter than a typical month in Busan — roughly 62% more rain than average.
- Busan is usually about 3°C warmer than Gangneung, 300 km away, in September.
Avg high
25°C
76°F
Avg low
19°C
67°F
Rainfall
197 mm
very wet
Humidity
81%
relative
Sky
67%
cloud · often cloudy
Busan weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 6°C / 42°F | -1°C / 30°F | 31 mm | 76% | 55% |
| February | 8°C / 46°F | 1°C / 33°F | 49 mm | 72% | 63% |
| March | 12°C / 54°F | 4°C / 39°F | 84 mm | 73% | 54% |
| April | 16°C / 61°F | 9°C / 47°F | 141 mm | 75% | 58% |
| May | 21°C / 70°F | 13°C / 56°F | 113 mm | 78% | 59% |
| June | 24°C / 75°F | 18°C / 64°F | 164 mm | 83% | 74% |
| July | 27°C / 80°F | 22°C / 72°F | 254 mm | 88% | 73% |
| August | 29°C / 83°F | 24°C / 75°F | 228 mm | 84% | 66% |
| September | 25°C / 76°F | 19°C / 67°F | 197 mm | 81% | 67% |
| October | 20°C / 68°F | 13°C / 56°F | 100 mm | 76% | 55% |
| November | 15°C / 58°F | 7°C / 45°F | 60 mm | 75% | 55% |
| December | 8°C / 46°F | 1°C / 33°F | 39 mm | 77% | 55% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Busan?
Compare the months in the chart above to find your ideal window.
Best time to visit Busan →Other South Korea cities in September
Cite or embed this data
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Busan weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/south-korea/busan/september
<a href="https://weathercompare.eu/weather/south-korea/busan/september">Busan weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/south-korea/busan" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Busan weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/south-korea/busan/september">Busan weather in September</a> – WeatherCompare</p>
Busan in September: quick answers
Is September a good time to visit Busan?
September is one of the wetter months in Busan, with about 197 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Busan in September?
Average highs are about 25°C (76°F) and average lows about 19°C (67°F), based on 10 years of daily data.
Does it rain a lot in Busan in September?
Busan typically gets around 197 mm of rain in September — very wet.
Figures are long-term averages for the area around Busan (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.