Seoul weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Seoul September weather at a glance
In September, Seoul averages 22.9°C, with typical highs of 26.9°C and lows of 19.7°C. The historical average is 13 wet days and 81% humidity.
Seoul September temperature & humidity
Seoul September rain & wet days
Pack a compact umbrella. Keep an indoor stop available between outdoor activities.
What to wear in Seoul in September
Choose breathable summer clothes and pack sun protection. Showers are possible, so a compact umbrella is useful. High humidity makes quick-dry clothing and a spare top especially useful.
- DaytimeBreathable short sleeves, hat and sunscreen · average high 26.9°C
- Morning & eveningLight layer for air-conditioned rooms · average low 19.7°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Seoul September sunrise & sunset times
2026 September · Local time (Asia/Seoul)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 06:02 | 19:02 | 13h 0m |
| 2026-09-15 | 06:14 | 18:41 | 12h 27m |
| 2026-09-30 | 06:26 | 18:17 | 11h 51m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
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Best months to visit Seoul
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Seoul weather like in September?
In September, Seoul averages 22.9°C, with typical highs of 26.9°C and lows of 19.7°C. The historical average is 13 wet days and 81% humidity. Our weather-comfort rating for this month is fair.
Does it rain a lot in Seoul in September?
There are about 13 wet days in September. A compact umbrella is still useful.
What should I wear in Seoul in September?
Choose breathable summer clothes and pack sun protection. Showers are possible, so a compact umbrella is useful. High humidity makes quick-dry clothing and a spare top especially useful.
What are the best months to visit Seoul?
Recent weather data rates April, May, October, November among the more comfortable months.
Where can I check Seoul weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
What time are sunrise and sunset in Seoul in September?
On 2026-09-15, calculated sunrise is 06:14 and sunset is 18:41 in local time (Asia/Seoul). Times vary by date and terrain.
Seoul weather by month
More South Korea destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations