The most comfortable time to visit Seoul is from September to October, and again from late April to mid June. For sun, aim for mid June to mid July; for walking, go from mid March to early May.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
For sun, go from mid June to mid July. It peaks in mid June, at 66. Avoid mid October to April for this: it falls to 0, mostly because it is too cool. The clearest skies come in December, when the sky is typically 38% covered at midday (partly cloudy).
The being outside season here runs from September to October, with a second spell from late April to mid June. It peaks in late September, at 87. The weakest stretch is from late November to early March, when it drops to 0, mostly because it is too cold.
For walking, go from mid March to early May, with a second spell from October to mid November. It peaks in mid October, at 84. Avoid late July to August for this: it falls to 0, mostly because it is too warm.
The year, measured
The average temperature in Seoul over the whole year is 13°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -4°C. The rainy (wet) season in Seoul runs from November, peaking in November with a 69% chance of rain on a given day. The dry season is December to February; December is the driest month, at 30%. Winds in Seoul are highest in April, averaging 1.4 m/s (5 km/h), and lightest in October, at 1.0 m/s (4 km/h). The prevailing wind is from the SW. The clearest skies in Seoul come in November, when the sky is typically 40% covered; August is the cloudiest month, at 70%.
Month by month Seoul climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 2°C | -4°C | -2°C | 39% | 44% | 1.1 m/s | 0 | 0 | 9 |
| February | 4°C | -2°C | 0°C | 41% | 42% | 1.3 m/s | 0 | 0 | 16 |
| March | 12°C | 4°C | 8°C | 51% | 42% | 1.3 m/s | 8 | 0 | 57 |
| April | 16°C | 9°C | 13°C | 49% | 41% | 1.4 m/s | 39 | 1 | 77 |
| May | 22°C | 15°C | 21°C | 56% | 51% | 1.2 m/s | 75 | 21 | 56 |
| June | 26°C | 20°C | 27°C | 41% | 56% | 1.2 m/s | 55 | 62 | 15 |
| July | 27°C | 23°C | 30°C | 44% | 67% | 1.2 m/s | 19 | 51 | 4 |
| August | 30°C | 25°C | 34°C | 56% | 70% | 1.1 m/s | 6 | 29 | 1 |
| September | 25°C | 18°C | 25°C | 44% | 55% | 1.2 m/s | 71 | 46 | 27 |
| October | 19°C | 11°C | 17°C | 40% | 43% | 1.0 m/s | 68 | 3 | 79 |
| November | 11°C | 5°C | 8°C | 69% | 40% | 1.0 m/s | 17 | 0 | 52 |
| December | 3°C | -2°C | -1°C | 30% | 40% | 1.1 m/s | 0 | 0 | 11 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Seoul weather by season
Year round, Seoul has days of about 2°C at their warmest in January, its coolest month, and 30°C in August, its warmest; the coolest hours of the day run from -4°C to 25°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around November and least likely around December. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Seoul weather in winterDecember to February
Winter in Seoul has typical daily highs of about 3°C and lows of about -3°C, with a 36% chance of rain on a given day.
Seoul weather in springMarch to May
Spring in Seoul has typical daily highs of about 17°C and lows of about 9°C, with a 52% chance of rain on a given day.
Seoul weather in summerJune to August
Summer in Seoul has typical daily highs of about 27°C and lows of about 23°C, with a 47% chance of rain on a given day.
Seoul weather in autumnSeptember to November
Autumn in Seoul has typical daily highs of about 18°C and lows of about 11°C, with a 51% chance of rain on a given day.
When is the rainy season in Seoul?
The rainy (wet) season in Seoul runs from November, peaking in November with a 69% chance of rain on a given day. The dry season is December to February; December is the driest month, at 30%.
What time of year is Seoul windiest?
Winds in Seoul are highest in April, averaging 1.4 m/s (5 km/h), and lightest in October, at 1.0 m/s (4 km/h). The prevailing wind is from the SW.
What is the average temperature in Seoul year round?
The average temperature in Seoul over the whole year is 13°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -4°C.
Where to go instead in early January, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.