Weather in Seoul in September
September in Seoul is warm outdoor weather. Days are long enough to be useful. Shade starts to matter at midday.
In South Korea, this is how Seoul actually wears September, not how a country centroid would. Compared with August and January, September sits in the middle of Seoul's year.
Pack for Seoul in September, not for a brochure that was photographed in another season.
- Average temp
- 22°C
18–26°C
- Rainfall
- 156 mm
A wet month
- Sunshine
- 5.7 h
hours per day
What to expect
Daytime
Warm days in Seoul in September. A hat starts to earn its keep at midday. Evenings are the comfortable part of the clock.
You can walk at more hours than in the fierce months. Still build in a pause when the sun is high. Nights are easy.
Rain
September is a wetter month in Seoul. Showers are part of the deal, not a spoiled surprise.
Waterproof shoes matter more than a rain plan for a beach, especially if a beach is not why you came. Build indoor hours into the afternoon.
Evening
Evenings are cooler. A layer helps after sunset.
What to pack
Rain jacket
A layer for cooler evenings
Where to stay in Seoul
Dates are a starting point for September.
Travel guides for Seoul
What to read before you book.
Average weather in Seoul
TemperatureRainfall
Similar weather in September
Other destinations whose September averages sit close to this one.
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FAQs about Seoul
Climate averages for Seoul, 1991–2020.
The best time to visit Seoul is between April and June, the most comfortable stretch of the year on these averages.
August is the hottest month, with an average around 27°C.
July is the wettest month, with about 422 mm of rain.
No. These are 1991–2020 climate normals from Meteostat, not a live forecast. Actual weather in any given week can differ.
