Honestly? July doesn’t sugarcoat it. If June was Seoul warming up, Seoul weather in July is the main event — and it comes in full force. The average temperature in July 2025 hit 28.8°C (84°F) — and on the hottest days, it pushed all the way to 38.0°C (100°F). Trust me, you’ll feel every degree of that.
But there’s also the rain. July is when Korea’s rainy season peaks — and in 2025, it peaked hard. This guide covers the actual numbers, what to wear, and how locals really get through it.
July 2025 Seoul — The Numbers
Here’s what the data actually looked like this year. The monthly average came in at 28.8°C (84°F), which is noticeably above the 10-year July average of 26.8°C. Highs averaged 32.6°C (91°F), and overnight lows sat at 25.7°C (78°F) — meaning even nights gave zero relief.
Early, Mid & Late July — Not the Same Trip
July isn’t one consistent month. It breaks into three pretty distinct phases, and which one you land in changes everything about your trip.
Early July (1st–10th) is brutal but manageable. Highs average around 33°C (91°F) and it’s sticky and hot, but rain is relatively light. Mid-July (11th–20th) is when the rainy season peaks — temperatures dip slightly but the downpours more than make up for it. In 2025, July 16th saw 73mm, the 17th another 75mm, and the 19th hit 84mm. Four days in a row. Late July (21st–31st) is when the heat explodes back — highs averaging 35°C (95°F) with July 27th hitting 38°C (100°F). This is also when 열대야 (yeoldaeya), tropical nights where temps don’t drop below 25°C, kicks in hard.
| Period | Avg High | Avg Low | What to expect |
| Early July (1–10) | 33°C (91°F) | 27°C (81°F) | Hot and humid, lighter rain — manageable if you start early |
| Mid July (11–20) | 29°C (84°F) | 23°C (73°F) | Rainy season peak — heavy downpours, keep plans flexible |
| Late July (21–31) | 35°C (95°F) | 27°C (81°F) | Extreme heat, tropical nights begin |
What to Wear in Seoul in July
Short answer: as little as socially acceptable. Koreans go full summer mode in July — sleeveless tops, linen shirts, light cotton dresses. Nobody’s carrying a jacket for outdoor use.
Here’s the real breakdown by time of day.
The indoor-outdoor AC temperature gap is real and it’s the thing that catches most visitors off guard. Korean AC in July is set aggressively cold — stepping from 33°C outside into a café or subway is jarring. That temperature swing is genuinely how summer colds happen. Locals know to carry a thin cardigan everywhere, and so should you.
Rain in July — This Is Not a Drill
Korea’s rainy season (jangma) usually peaks in mid-July, and 2025 was no exception. Just four days — July 16th through 19th — dropped a combined 249mm of rain on Seoul. That’s not a passing shower. That’s “cancel your outdoor plans and find a café” rain.
Here’s the thing about jangma rain that people don’t realize until they’re caught in it: the humidity is so intense that getting soaked doesn’t just make you wet — your clothes won’t fully dry out, and if they sit damp too long, they start to smell. Everyone in Seoul walks around with an umbrella for a reason. It’s not optional. An umbrella in July is as essential as your phone.
Practical Tips for July in Seoul
What’s Happening in Seoul in July
The heat doesn’t stop Seoul from being fun. Han River parks — Yeouido, Ttukseom, Banpo — fill up every evening with locals doing 치맥 (chimaek): fried chicken and beer by the water. It’s a very specific summer vibe that genuinely captures something about Seoul that you won’t find in any other season.
Café-hopping in Seongsu-dong, Ikseon-dong, and Yeonnam-dong is a solid strategy for the hot afternoon hours. Strong AC, great coffee, and the kind of interior design that makes everything look like a photo. You’re not hiding from the heat — you’re just being strategic about it. And if you’re into K-beauty, July is when brands run their full summer skincare lines — sunscreens, cooling mists, light moisturizers. An Olive Young stop is worth it.
Seoul weather in July 2025 ran hotter than the 10-year average, but the energy of the city more than makes up for it. Dress right, keep your umbrella close, and plan your outdoor time for the morning hours — and you’ll have a great time.
→ Related: Seoul Weather in June — Is It Already Summer?