Today, 2026-09-18: Mostly clear, 27°C / 17°C, rain chance 2%. Fine dust PM2.5 12 µg/m³ (Good), PM10 15 µg/m³. What to wear: warm — short sleeves; a light layer for evenings.
7-day forecast
| Day | Sky | High / Low | Rain chance | Wind |
|---|---|---|---|---|
| Fri 09/18 | Mostly clear | 27° / 17° | 2% | 9 km/h |
| Sat 09/19 | Partly cloudy | 27° / 19° | 0% | 7 km/h |
| Sun 09/20 | Mostly clear | 27° / 17° | 0% | 6 km/h |
| Mon 09/21 | Clear | 30° / 18° | 0% | 5 km/h |
| Tue 09/22 | Overcast | 31° / 18° | 8% | 11 km/h |
| Wed 09/23 | Overcast | 28° / 19° | 17% | 14 km/h |
| Thu 09/24 | Light drizzle | 28° / 20° | 10% | 10 km/h |
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FAQ
What is the weather in Seoul today?
2026-09-18: Mostly clear, high 27°C, low 17°C, chance of rain 2%. Fine dust (PM2.5) is around 12 µg/m³ — Good on the Korean scale.
What should I wear in Seoul this week?
Highs run 27–31°C: hot — light, breathable clothes; sun protection.
Will it rain in Seoul this week?
No day this week shows a rain chance of 50% or more in the current forecast.
How accurate is this forecast?
It is the Open-Meteo model forecast for central Seoul (37.57°N, 126.98°E), refreshed every morning Korea time. Beyond three days, treat it as a trend rather than a promise; check again the day before you travel.
Source: Open-Meteo forecast and air-quality models for central Seoul · updated 2026-09-18