Seoul Weather by Month
Twelve months of Seoul, South Korea weather — averages from 2006–2025.
Seoul's warmest month is August (average high 29.1°C (84.4°F)) and the coolest is January (1.8°C (35.2°F)). The most rain falls in July (about 343 mm), and January is the driest (about 15 mm). May is the sunniest, with about 9.9 hours of sunshine a day.
Best months to visit Seoul
Ranked within Seoul's own year by temperature comfort, rainy days and sunshine — historical averages, not a forecast.
Seoul month by month
January
FairHigh 1.8°C (35.2°F)
Low -7.1°C (19.2°F)
- Rainfall
- 15 mm (0.6 in)
- Rainy days
- 3 rainy days
- Sunshine
- 7.9 h sunshine / day
February
FairHigh 4.8°C (40.6°F)
Low -4.9°C (23.2°F)
- Rainfall
- 24 mm (0.9 in)
- Rainy days
- 4 rainy days
- Sunshine
- 8.5 h sunshine / day
March
FairHigh 10.7°C (51.3°F)
Low -0.2°C (31.6°F)
- Rainfall
- 43 mm (1.7 in)
- Rainy days
- 7 rainy days
- Sunshine
- 9.2 h sunshine / day
April
GoodHigh 16.8°C (62.2°F)
Low 5.7°C (42.3°F)
- Rainfall
- 72 mm (2.8 in)
- Rainy days
- 8 rainy days
- Sunshine
- 9.5 h sunshine / day
May
GreatHigh 22.4°C (72.3°F)
Low 11.6°C (52.9°F)
- Rainfall
- 100 mm (4 in)
- Rainy days
- 8 rainy days
- Sunshine
- 9.9 h sunshine / day
June
GreatHigh 26.9°C (80.4°F)
Low 17.5°C (63.5°F)
- Rainfall
- 121 mm (4.8 in)
- Rainy days
- 9 rainy days
- Sunshine
- 9.9 h sunshine / day
July
FairHigh 28.5°C (83.3°F)
Low 21.8°C (71.2°F)
- Rainfall
- 343 mm (13.5 in)
- Rainy days
- 17 rainy days
- Sunshine
- 7.8 h sunshine / day
August
FairHigh 29.1°C (84.4°F)
Low 22.4°C (72.3°F)
- Rainfall
- 257 mm (10.1 in)
- Rainy days
- 16 rainy days
- Sunshine
- 8.9 h sunshine / day
September
GreatHigh 25.1°C (77.2°F)
Low 17°C (62.6°F)
- Rainfall
- 135 mm (5.3 in)
- Rainy days
- 8 rainy days
- Sunshine
- 8.4 h sunshine / day
October
GreatHigh 19°C (66.2°F)
Low 9.5°C (49.1°F)
- Rainfall
- 65 mm (2.6 in)
- Rainy days
- 6 rainy days
- Sunshine
- 8.5 h sunshine / day
November
FairHigh 11°C (51.8°F)
Low 2°C (35.6°F)
- Rainfall
- 50 mm (1.9 in)
- Rainy days
- 7 rainy days
- Sunshine
- 7.5 h sunshine / day
December
FairHigh 3.1°C (37.6°F)
Low -5.2°C (22.6°F)
- Rainfall
- 25 mm (1 in)
- Rainy days
- 5 rainy days
- Sunshine
- 7.4 h sunshine / day
More South Korea cities by month
Based on 20 years of historical weather data (2006–2025) from Open-Meteo. Monthly averages, not a forecast.