Seoul weather in December
In December, Seoul has an average high of 3 °C37 °F and an average low of −4 °C24 °F, with about 22 mm0.9 in of precipitation. It is the 11th warmest month of the year and ranks 11th for precipitation.
How December compares with other months
Compared with November, December is 7.5 °C13.6 °F cooler on average and drier by 25 mm1.0 in. Compared with January, December is 2.3 °C4.1 °F warmer on average. Daylight lasts about 9.6 hours around the middle of the month. Average relative humidity is 76% and the average cloud amount 55%.
Is December a good time to visit Seoul?
December is not among the most comfortable months by our comfort score: it is cool (average high 3 °C37 °F) and nights are cold (average low −4 °C24 °F). The most comfortable months in Seoul are May and October.
What to wear in December
For Seoul in December, pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
December in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Seoul | 337 | −424 | 220.9 |
| Hanam | 236 | −719 | 220.9 |
| Paju | 235 | −818 | 200.8 |
| Yangju | 134 | −818 | 200.8 |
| Suwon | 337 | −424 | 220.9 |
| Hwaseong-si | 439 | −228 | 261.0 |
| Osan | 439 | −228 | 261.0 |
| Kaesŏng | 235 | −621 | 190.7 |
| Chuncheon | 135 | −818 | 230.9 |
Nearby places that are more than 1 °C1.8 °F warmer in December: Hwaseong-si and Osan; cooler: Hanam, Paju, Yangju and Kaesŏng.
Other months in Seoul
- January1 °C33 °F / −7 °C20 °F
- February3 °C38 °F / −5 °C23 °F
- March9 °C48 °F / −1 °C30 °F
- April15 °C60 °F / 5 °C40 °F
- May21 °C70 °F / 11 °C52 °F
- June26 °C78 °F / 17 °C62 °F
- July28 °C82 °F / 21 °C70 °F
- August28 °C83 °F / 22 °C71 °F
- September25 °C76 °F / 17 °C62 °F
- October19 °C65 °F / 10 °C49 °F
- November11 °C51 °F / 3 °C37 °F
- December3 °C37 °F / −4 °C24 °F
Frequently asked questions
How warm is Seoul in December?
In December the average high in Seoul is 3 °C (37 °F) and the average low is -4 °C (24 °F).
Does it rain a lot in Seoul in December?
On average about 22 mm (0.9 in) of precipitation falls in December; it ranks 11th of the 12 months.
Is December the warmest month in Seoul?
No. The warmest month in Seoul is August, with an average high of 28 °C (83 °F). The coldest month is January, with an average low of -7 °C (20 °F).
How long is the day in Seoul in December?
In the middle of December the day in Seoul lasts about 9.6 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Seoul in December?
The average relative humidity in December is about 76%. This is a long-term average for the whole day.
How cloudy is Seoul in December?
On average about 55% of the sky is covered by cloud in December. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.