Seoul weather in September
Seoul in September averages 22°C (72°F), 156 mm of rain and 5.7 hours of sun a day. It is one of the wetter months of the year here.
Of the twelve months in Seoul, September is the fourth warmest, the third wettest and the sixth dullest.
- Average temp
- 22°C (72°F)
18–26°C · 64–79°F
- Rainfall
- 156 mm
A wet month
- Sunshine
- 5.7 h
hours per day
What is Seoul like in September?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Expect frequent rain — this is a wet month.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for Seoul in September?
A proper waterproof, not a folding umbrella
156 mm in the month usually arrives as heavy bursts that an umbrella will not cover.
A dry bag for phone and documents
Worth it for one downpour caught between the taxi and the door.
A layer for the evening
Evenings cool off noticeably once the sun is down.
September compared with August and October
September in Seoul is 4.6°C cooler than August and 233 mm drier than it, which averages 27°C (80°F).
September in Seoul is 6.6°C warmer than October and 107 mm wetter than it, which averages 15°C (60°F).
Daylight in Seoul in September
On 15 September the sun is up for 12 hours 26 minutes in Seoul, rising about 06:13 and setting about 18:39 local time.
September ends 1 hour 9 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 2 hours 19 minutes short of June, the longest-lit month here.
Where to stay in Seoul
Dates are a starting point for September.
Travel guides for Seoul
What to read before you book.
Seoul weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | -2°C / 29°F | 18 mm |
| February | 1°C / 34°F | 28 mm |
| March | 6°C / 44°F | 38 mm |
| April | 13°C / 55°F | 70 mm |
| May | 19°C / 65°F | 104 mm |
| June | 23°C / 74°F | 138 mm |
| July | 25°C / 78°F | 422 mm |
| August | 27°C / 80°F | 390 mm |
| September | 22°C / 72°F | 156 mm |
| October | 15°C / 60°F | 49 mm |
| November | 8°C / 46°F | 50 mm |
| December | 0°C / 32°F | 20 mm |
Similar weather in September
Other destinations whose September averages sit close to this one.
Check another month
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FAQs about Seoul in September
September climate averages for Seoul, 1991–2020.
Seoul averages 22°C (72°F) in September, ranging from about 18°C (64°F) at night to 26°C (79°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Yes, a lot. September brings about 156 mm, which makes it one of the wetter months here — expect heavy bursts rather than all-day drizzle.
Yes. September averages 22°C (72°F) against 15°C (60°F) in October — 6.6°C warmer.
September is 4.6°C cooler than August, and 233 mm drier.
It is outside the easiest window. The most comfortable stretch here is April to June; September sits outside it, which usually means more heat, more rain, or both — worth it if you would rather have the place to yourself.
About 5.7 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 26 minutes of daylight in mid-September, against 14 hours 45 minutes in June and 9 hours 35 minutes in December.
On 15 September, sunrise is about 06:13 and sunset about 18:39 local time. Both shift across the month — the month ends 1 hour 9 minutes shorter than it starts.
