Seoul Weather in September
25.2°C high · 16°C low · 150 mm rain · 6.5h sun
Sep is a warm month in Seoul — not peak season, but a good time to avoid crowds.
September at a glance
| Metric | Value |
|---|---|
| Average high | 25.2°C |
| Average low | 16°C |
| Rainfall | 150 mm |
| Sunshine | 6.5 hours/day |
| Daylight | 12.2 hours |
What to pack in September
Pack comfortable clothes with a light layer for evenings, plus a raincoat and umbrella for Seoul in September.
Seoul weather by month
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Frequently asked questions
What is the weather in Seoul in September?
Highs of 25.2°C and lows of 16°C, with about 150 mm of rain and 6.5 hours of sunshine per day.
Is September a good time to visit Seoul?
Sep is a warm month in Seoul — not peak season, but a good time to avoid crowds.
What to do in Seoul · Best time to visit Seoul
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.