Seoul Climate by Month – Rainy Season, Temperature Averages
Summary
The climate figures for Seoul are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 1,300 mm.
The rainy season runs May–September. The wettest month is July with 313.4 mm across 17 rain days; the driest is January at just 18 mm.
The hottest month is August (average high 29.4°C) and the coolest is January (1.9°C).
The most comfortable time to visit Seoul is January — less rain and milder heat.
Monthly averages · 2016–2025
| Monthly averages | High | Low | Rainfall | Rainy season |
|---|---|---|---|---|
| January | 1.9° | -6.6° | 18 mm | 3 |
| February | 4.7° | -5.0° | 25 mm | 5 |
| March | 11.6° | 0.3° | 43 mm | 6 |
| April | 17.7° | 6.4° | 64 mm | 7 |
| May | 22.6° | 11.8° | 111 mm | 8 |
| June | 27.0° | 17.7° | 126 mm | 10 |
| July | 29.2° | 22.3° | 313 mm | 17 |
| August | 29.4° | 22.7° | 276 mm | 16 |
| September | 25.3° | 17.4° | 160 mm | 9 |
| October | 18.6° | 9.4° | 85 mm | 7 |
| November | 11.2° | 1.7° | 51 mm | 6 |
| December | 3.0° | -5.3° | 28 mm | 5 |