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South Korea
Seoul weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Seoul?
For a warm holiday, the best week has been 3–9 June (Weather Index 95). Favourable start dates for a 7-day trip run from 28 May to 11 June. August is warmest (31°C), January is driest and April, May and June have the most sun.
- Warmest
- August 31°C
- Coolest
- January 3°C
- Driest
- January 10% rain-day chance
- Wettest
- July 53% rain-day chance
- Sunniest
- April, May and June 10 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Seoul
Seoul historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 3.2 | -6.2 | 10.3 | 3.2 | 19.0 | 8.0 |
| February | 5.8 | -4.2 | 13.9 | 3.9 | 23.2 | 8.7 |
| March | 13.1 | 1.6 | 18.7 | 5.8 | 41.1 | 9.5 |
| April | 19.1 | 7.6 | 21.3 | 6.4 | 62.7 | 9.9 |
| May | 23.7 | 12.8 | 26.1 | 8.1 | 105.2 | 10.0 |
| June | 27.9 | 18.7 | 30.0 | 9.0 | 115.6 | 10.1 |
| July | 30.1 | 23.5 | 52.9 | 16.4 | 281.6 | 8.3 |
| August | 30.6 | 23.7 | 46.5 | 14.4 | 243.5 | 8.8 |
| September | 26.8 | 18.3 | 31.7 | 9.5 | 147.8 | 8.4 |
| October | 20.3 | 10.2 | 23.2 | 7.2 | 75.6 | 8.2 |
| November | 13.1 | 2.5 | 17.3 | 5.2 | 45.5 | 8.0 |
| December | 4.5 | -4.7 | 15.5 | 4.8 | 26.4 | 7.6 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.