Seoul Weather in September
South Korea · 30-year monthly averages
👍 Good time to visit
September in Seoul is warm, with average daytime highs around 26°C (79°F) and nighttime lows near 18°C (64°F). Expect roughly 142mm of precipitation spread over about 7 rainy days, and this is one of the wetter months.
Avg high
26°C
79°F
Avg low
18°C
64°F
Rainfall
142mm
rainy
Rainy days
7
days with ≥1mm
☀️ About 180 hours of sunshine over the month (~6h/day).
🎒 What to pack
- light summer clothing
- sunscreen and sunglasses
- compact umbrella or rain jacket
September vs the rest of the year
FAQ
- How hot is Seoul in September?
- September in Seoul is warm, with average daytime highs around 26°C (79°F) and nighttime lows near 18°C (64°F). Expect roughly 142mm of precipitation spread over about 7 rainy days, and this is one of the wetter months.
- Does it rain a lot in Seoul in September?
- Seoul sees around 142mm of precipitation in September on average — rainy by global standards.
- Is September a good time to visit Seoul?
- September is a good month to visit Seoul, with generally agreeable conditions.