Weather in Seoul in April

A good month. April works. It is not the peak, but nothing about it fights you. Highs average 15.6 °C, lows 5 °C, and rain falls on 7 days — nothing in the month is working against you.

April ranks 5 of 12 in Seoul: past the worst of the year but short of May, which is the month to book if the dates are open.

Rain on 7 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 15.6 °C days and 5 °C nights; the spread matters more here than any single number.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest April day reached 25.4 °C and the coldest night fell to -2.5 °C, and the wettest single day dropped 72 mm — roughly 100% of the month's rain in one day.

April is moderately variable: 13 mm in the driest year against 150 mm in the wettest, around an average of 72 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 11.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 74%.

How April sits in the year

The month is on the way up: 6.5 °C warmer than March, and May adds another 5.9 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in April

13.1 hours of daylight, gaining 1.1 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

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

April 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 — 3.2 °C warmer, 1 day more rain. Gwangju is close enough to be a coin toss — 2.6 °C warmer, 1 day more rain.

So: April works, with May the better month by 11 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Seoul

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