Best time to visit Seoul
The best months to visit Seoul are May, September and October, based on month-by-month temperature and rainfall data. The full year of weather, daylight, holidays, and festival timing is below.
May, September and October score best for Seoul weather:
- May23° / 13°CMay is one of Seoul's easiest months, warm enough for Namsan and Hongdae nights before summer humidity.
- September26° / 17°CSeptember is cooler after the monsoon, with Olympic Park's Hanseong Baekje festival and better evenings in Hongdae.
- October20° / 10°COctober is Seoul's best walking month, with clear air for Namsan, palace courtyards, and Bukhansan or Han River extensions.
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By TripSapien Research · Updated May 20, 2026
Seoul weather by month
| Month | High | Low | Rain (mm) | Rainy days | Daylight | Sea |
|---|---|---|---|---|---|---|
| January | 2° | -7° | 20 | 7 | 10h | 3° |
| February | 5° | -4° | 22 | 6 | 10h | 1° |
| March | 11° | 1° | 41 | 10 | 11h | 4° |
| April | 18° | 7° | 71 | 11 | 13h | 11° |
| MayBest weather | 23° | 13° | 97 | 12 | 14h | 17° |
| June | 27° | 18° | 132 | 13 | 15h | 24° |
| July | 29° | 23° | 303 | 22 | 15h | 27° |
| August | 30° | 23° | 267 | 22 | 14h | 30° |
| SeptemberBest weather | 26° | 17° | 122 | 13 | 13h | 27° |
| OctoberBest weather | 20° | 10° | 59 | 9 | 12h | 22° |
| November | 12° | 2° | 48 | 11 | 11h | 15° |
| December | 4° | -5° | 22 | 8 | 10h | 8° |
Temperatures in °C. Long-term monthly averages.
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Seoul month by month
January
Seoul in January: 2.4°C high, -6.7°C low, 19.5mm rain over 7 days, 9.9h daylight. Cold and clearer — short daylight but skies open.
February
Seoul in February: 5.4°C high, -4.4°C low, 21.6mm rain over 6 days, 10.3h daylight. Cold and clearer — short daylight but skies open.
March
Seoul in March: 11.3°C high, 0.6°C low, 40.9mm rain over 10 days, 11.4h daylight. Mild and dry — shoulder-season sweet spot.
April
Seoul in April: 18°C high, 6.6°C low, 70.5mm rain over 11 days, 12.6h daylight. Mild and dry — shoulder-season sweet spot.
MayBest weather
Seoul in May: 23.3°C high, 12.5°C low, 97.3mm rain over 12 days, 13.8h daylight. Mild and dry — shoulder-season sweet spot.
June
Seoul in June: 27.2°C high, 18.2°C low, 132.3mm rain over 13 days, 14.6h daylight. Mild but rainy — flexible plans pay off.
July
Seoul in July: 29°C high, 22.5°C low, 303mm rain over 22 days, 14.7h daylight. Hot and rainy — afternoon storms, plan indoor afternoons.
August
Seoul in August: 29.7°C high, 22.8°C low, 267.2mm rain over 22 days, 14.1h daylight. Hot and rainy — afternoon storms, plan indoor afternoons.
SeptemberBest weather
Seoul in September: 26°C high, 17.1°C low, 121.8mm rain over 13 days, 13h daylight. Mild but rainy — flexible plans pay off.
OctoberBest weather
Seoul in October: 20.1°C high, 9.6°C low, 58.9mm rain over 9 days, 11.8h daylight. Mild and dry — shoulder-season sweet spot.
November
Seoul in November: 12.2°C high, 2.4°C low, 47.8mm rain over 11 days, 10.6h daylight. Mild and dry — shoulder-season sweet spot.
December
Seoul in December: 4.2°C high, -4.6°C low, 21.6mm rain over 8 days, 9.8h daylight. Cold and clearer — short daylight but skies open.
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