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In one line
Korea’s record October heat ended in mid-October when a cold front and nationwide rain brought a sharp chill, and researchers forecast a possible super El Niño bringing a ‘rollercoaster winter’ and wetter November.
⚡ Latest developments
- Nov 2 The FBI attributed a $6.3 billion Binance heist to North Korea’s TraderTraitor group.
- Oct 30 Analysts linked the record Binance hack, valued at $6.4 billion at the time, to North Korea’s TraderTraitor group, and Binance moved to shore up user confidence.
What this means if you are travelling to Korea
- Expect sharply cooler weather after the unseasonal warmth—pack layers.
- Prepare for a possible wetter November; the forecast super El Niño may double rainfall.
- Watch for weather alerts, as conditions shifted quickly in mid-October.
01 What happened
| Where | South Korea, including Seoul (30.1°C) and Daejeon (31.5°C), which set October records on October 12 before the cold front moved in nationwide. |
|---|---|
| What | South Korea had its highest October temperatures on record, then rain with strong gusts ended the warm spell and temperatures plunged overnight into a sudden chill. |
02 Why it is happening
Researchers at Seoul National University forecast a possible super El Niño that may double November rainfall and bring a ‘rollercoaster winter’. Analysts also linked the late-season warmth to warming patterns such as blocking anticyclones, the mechanism cited for record October heat elsewhere. The warmth also caused a surge in mosquitoes, shifting their activity patterns.
03 How it has unfolded
- Nov 2 UpdateThe FBI attributed a $6.3 billion Binance heist to North Korea’s TraderTraitor group. — The Tech Buzz, Wilts and Gloucestershire Standard
- Oct 30 UpdateAnalysts linked the record Binance hack, valued at $6.4 billion at the time, to North Korea’s TraderTraitor group, and Binance moved to shore up user confidence. — Reuters, The Crypto Times
- Oct 16 UpdateSingle reportRussian October heat records were attributed to blocking anticyclones, a warming pattern that analysts say helps explain the unusual late-season warmth Korea experienced before the sudden chill. — Tech Times
- Oct 13 UpdateSingle reportA cold front ended Lincoln’s record-breaking October heat, mirroring the chill that had already moved into South Korea; travelers should stay ready for sharply cooler weather. — Lincoln Journal Star
- Oct 13 UpdateSingle reportSunflowers bloomed in Daejeon amid the record October heat, an unusual sight reflecting the prolonged unseasonal warmth before the chill arrived. — 조선일보
- Oct 13 UpdateSingle reportRain fell nationwide with strong gusts as cold air moved in, with temperatures set to plunge overnight, ending the warm spell; visitors should ready for the sudden chill. — SBS 뉴스
- Oct 12 UpdateSeoul hit 30.1°C and Daejeon 31.5°C, the highest October temperatures on record in South Korea. — Chosunbiz, The Korea Times
- Oct 12 UpdateThe record October heat ended as rain arrived, bringing sharply colder weather, so visitors should prepare for a sudden chill after the unseasonal warmth. — Chosunbiz, news.sbs.co.kr
Earlier (2)
- Oct 9 NewSeoul National University researchers forecast a possible super El Niño that may double Korea’s November rainfall, and JoongAng reported it could bring a ‘rollercoaster winter’. — DongA Science, 조선일보
- Oct 3 UpdateAn October heat wave in South Korea caused a surge in mosquitoes, shifting their activity patterns as unusually warm weather continued. — Chosunbiz
04 Who is reporting it
- Record profits fail to shield Samsung, SK hynix stocks as AI spending fears rattle markets — Korea JoongAng Daily, Nov 1
- Binance seeks to shore up confidence after record $6.3 billion heist — Reuters, Oct 30
- Heat illness insurance payouts surge fourfold in Gyeonggi’s record summer — Korea JoongAng Daily, Oct 29
- Climate change must be declared ‘global health emergency’: Lancet study — The Korea Herald, Oct 28
- Global greenhouse gas levels hit new heights in 2025: report — The Korea Times, Oct 28
- Heat killed ‘staggering’ 50,000 people in Europe’s cities this summer, scientists warn — The Guardian, Oct 23
- Europe’s killer heat this summer claims 50,000 lives. Climate change blamed for two-thirds of deaths — The Korea Times, Oct 23
- Burnham to reveal plans for AI unit to tackle wildfires after scorching summer — The Guardian, Oct 23
- Semiconductor boom drives South Korea exports to record early‑October high – CHOSUNBIZ — Chosunbiz, Oct 21
- Record hot day in Raleigh in the middle of October, families said they have mixed feelings — CBS17.com, Oct 15
- NEW DAY at arirang — Arirang TV, Oct 13
- Seoul temperature breaks all-time October record — The Korea Times, Oct 12
80 more reports tracked.
05 Our guides on this
Questions people ask
When did Korea’s October heat end?
Rain fell nationwide with strong gusts as cold air moved in around October 12–13, ending the record warm spell with temperatures set to plunge overnight.
What were the record October temperatures?
On October 12, Seoul hit 30.1°C and Daejeon 31.5°C—the highest October temperatures on record in South Korea. Sunflowers even bloomed in Daejeon amid the heat.
Will Korea’s winter be colder or warmer?
Seoul National University researchers forecast a possible super El Niño that may double November rainfall, which JoongAng reported could bring a ‘rollercoaster winter’.
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