Weather in Seoul in October

Prime time. October is about as good as Seoul gets. Highs average 18.7 °C, lows 9.8 °C, and rain falls on 6 days — nothing in the month is working against you.

October ranks 2 of 12 in Seoul. Only May scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain falls on only 6 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average October reaches 30 °C. Across the twenty years measured, the hottest October day reached 27.1 °C and the coldest night fell to -1 °C, and the wettest single day dropped 49 mm — roughly 92% of the month's rain in one day.

October is moderately variable: 6 mm in the driest year against 108 mm in the wettest, around an average of 53 mm. Roughly two Octobers in three land near that average, and the third does something else entirely.

Wind is light at 9.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 75%, high enough to notice on the warm days without dominating them.

How October sits in the year

The month is on the way down: 6 °C cooler than September, with November dropping another 7.8 °C. The first week and the last are not the same trip.

Daylight in October

11.3 hours of daylight, losing 1.2 hours across the month. That is between Seoul's extremes of 14.7 and 9.6 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 35.2 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

October in Seoul versus nearby

If Seoul is one option among several, the nearby comparison is worth making. Daegu is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Gwangju is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: October is effectively as good as it gets here — 0 points behind May, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Seoul

See all twelve months in Seoul, or where else to go in October.