Weather in Seoul in July

Shoulder season. July is shoulder season in Seoul — cheaper, quieter, and a genuine gamble. You should expect rain on 18 days of the month, which is more days wet than dry.

July ranks 6 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.

This is wet-season rain: 18 wet days and 9 genuinely heavy ones, which in this climate means concentrated downpours rather than all-day grey. The pattern is usually a clear morning and a loud afternoon, so front-load the day and stop fighting the 3pm hour. Natural fibres and a second shirt for the day. At 84% nothing dries, including you.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest July day reached 34 °C and the coldest night fell to 16.3 °C, and the wettest single day dropped 175 mm — roughly 48% of the month's rain in one day.

July is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest July on record still delivered 737 mm against 140 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 361 mm average is a reasonable planning figure, not a promise.

Wind is light at 9.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How July sits in the year

Temperatures hold steady either side: 25.8 °C in June, 27.7 here, 28.5 in August. Nothing about the timing within the month matters much. Rain has already shifted: 8 days more than June had.

Daylight in July

July is at or near the longest days of Seoul's year: 14.5 hours of daylight, losing 0.6 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

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.

July in Seoul versus nearby

If Seoul is one option among several, the nearby comparison is worth making. Daegu is the weaker option in July — 2.1 °C warmer, 1 day less rain. Gwangju is the weaker option in July — within a degree on temperature, 1 day less rain.

So: July is a compromise. May is 25 points better and is what Seoul is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Seoul

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