Seoul Weather in January
South Korea · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
January in Seoul sees average temperatures ranging from a low of -6.6°C (20.1°F) to a high of 2.5°C (36.5°F), with a mean of -2.7°C (27.1°F). Compared to the annual average of 11.9°C (53.4°F), this month is 14.6°C cooler than the yearly norm. This is the coldest month of the year, with average lows of -6.6°C (20.1°F). Precipitation averages 28.0mm, making it approximately 98.0mm drier than the monthly average of 126.0mm. The city receives an average of 7.4 hours of sunshine per day during January, with relative humidity averaging 60.7%. Wind speeds reach an average maximum of 15.9 km/h. Snowfall averages 4.6cm during January, which can affect travel plans and outdoor activities. For travelers, this month offers a coldest month of the year experience in Seoul, with drier-than-average conditions compared to the rest of the year.
Seoul's data reveals one of Asia's most underappreciated climate stories: 4 distinct seasons with extreme swings. January averages -5°C; August hits 30°C with 80% humidity — a 35°C annual swing. I tracked a week there last April and the cherry blossoms aligned perfectly with 16°C and 8 sunshine hours. The numbers say avoid July's monsoon (300mm+ of rain) and August's heat. September-October is the statistical sweet spot: 18°C, 40mm rain, UV dropping to 5. December-February has its own appeal if you can handle -10°C with wind chill.
January vs Adjacent Months
| Metric | December | January | February |
|---|---|---|---|
| Mean Temp | -1.9°C (28.6°F) | -2.7°C (27.1°F) | 0.1°C (32.2°F) |
| Rainfall | 21.8mm | 28.0mm | 28.4mm |
| Sunshine | 7.4 hrs | 7.4 hrs | 7.9 hrs |
| Humidity | 62.5% | 60.7% | 65.6% |
| Wind | 15.5 km/h | 15.9 km/h | 17.5 km/h |
| Rainy Days | 5.2 | 4.4 | 5.0 |
| Snowfall | 3.7 cm | 4.6 cm | 6.1 cm |
Seasonal Context
January falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Seoul in January, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Seoul in January?
The average temperature in Seoul during January ranges from -6.6°C (20.1°F) to 2.5°C (36.5°F), with a mean of -2.7°C (27.1°F).
How much does it rain in Seoul in January?
Seoul receives an average of 28.0mm of precipitation in January, spread across approximately 4.4 rainy days.
What should I pack for Seoul in January?
Based on January weather data, pack heavy winter clothing, thermal layers, and a warm coat.
Is January a good time to visit Seoul?
January is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Seoul
Cities with Similar January Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 37.57°, 126.98°. Timezone: Asia/Seoul. Last updated: 2026-07-30.