Seoul September weather
Seoul, South Korea · September
Daytime can feel summer-like; evenings start to cool
September often mixes lingering summer warmth with cooler evenings. Comfort can swing within the month.
After rain, humidity can rebound and feel heavy again; breezy nights can feel noticeably cooler.
September averages at a glance
Average low
around 17–20°C
Average high
around 24–28°C
Average rainfall
around 90–170 mm
Wet days
about 6–9 days
What to wear in September in Seoul
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Short sleeves by day with a thin layer at night works well.
- • A compact umbrella helps on unsettled days.
Travel tips for visiting Seoul in September
- • If you plan night walks (river/Namsan), dress for cooler evening feel.
- • After rain, humidity can rise—schedule slack helps.
September weather in Seoul — FAQ
Q. Do I need long sleeves in September?
A. Often short sleeves are fine in daytime, but evenings can feel cool. A thin layer keeps it flexible.
Q. Do typhoons affect Seoul?
A. Direct hits aren’t constant, but influence can bring heavy rain. Forecast checks help.
Explore Seoul
These pages are connected so you can compare conditions and decide for yourself.