What to wear in September
Late summer into early fall. Hot afternoons, cooler mornings — bring a layer.
September moves from late summer into early autumn. Afternoons stay hot while mornings and evenings turn cool, and by Chuseok there's a real autumn feel. Lingering heat and a returning daily swing arrive together.
A tee with a thin shirt or cardigan — off when it's hot, on when it's cool — works well. As the month goes on, single-long-sleeve days grow more common, so shift the balance toward autumn with cotton pants and slacks.
Seoul averages 18°C at night and 27°C by day. Afternoons still feel like August while mornings drop to eighteen, so the daily swing widens again. Summer clothes plus one thing to throw on is the natural bridge.
Seoul weather in September
See what to wear at 25°C
What to wear across September's range
September holds both 18°C and 27°C inside a single day. Pick by the reading you actually get.
What to wear in September, women and men
For women in September, early days still call for short sleeves while late September shifts to a thin knit or cardigan. For men the split runs through the same month, so checking the morning low is all it takes to decide whether to bring a layer.
Recommended items
Styling tips
- Tee with a light shirt
- A thin layer for evenings
- Cotton pants or slacks
Related situations
Frequently asked
Can I switch to long sleeves in September?
From late month, single-long-sleeve days increase. In the hot early weeks, a tee plus a light layer is better.
How do I handle September's swing?
Hot by day, cool morning and evening. One easy-off light layer bridges the gap.
What's good for a Chuseok outing?
An easy long sleeve and cotton pants with a light layer. On still-hot days, a tee under a shirt works too.
What is the weather like in Seoul in September?
Typically 18°C to 27°C. Late-summer heat lingers into early September, then mornings turn clearly cool around the Chuseok holiday.