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Seoul Hits 40.2°C in Nowon, First Time Above 40 Since 2018

Seoul Hits 40.2°C in Nowon, First Time Above 40 Since 2018 — Newsmesis editorial illustration
— Newsmesis illustration

What happened

An automatic weather station in Seoul's northern Nowon ward recorded 40.2 degrees Celsius at 3:28 p.m. Friday, the Korea Meteorological Administration said — the first time the capital has topped 40 C since Aug. 1, 2018, when it hit a record 41.8 C. The same heat wave pushed readings to 40.7 C in Hanam's Deokpung district just outside Seoul and 40.2 C in the southern city of Gwangyang, some 300 kilometers away. Nationwide, the average number of heat wave days since June 1 has reached 14.8, the fourth-highest tally since observation records began in 1973, while tropical nights have hit a record 13.

What we know

SBS Newsnews.sbs.co.krYonhap (English)en.yna.co.kr
  • Seoul's Nowon ward hit 40.2 C at 3:28 p.m. on Aug. 7, per the Korea Meteorological Administration (KMA), cited by Yonhap.
  • It is Seoul's first reading above 40 C since Aug. 1, 2018, when the city recorded 41.8 C, per KMA data.
  • Hanam's Deokpung district, just southeast of Seoul, reached 40.7 C at 2:32 p.m., the day's highest nationwide reading, per KMA.
  • Gwangyang, about 300 km south of Seoul, hit 40.2 C at 2:37 p.m., while Yeongwol and Yeoju both reached 39.8 C, per KMA.
  • The nationwide average of heat wave days (33 C or higher) since June 1 stands at 14.8, the fourth-highest since the observation network expanded in 1973, and tropical nights have hit a record 13, per KMA.

What we don't know yet

  • How long the extreme heat will persist beyond the weekend; KMA forecasts only slight easing, with highs still reaching up to 35 C Saturday in some areas.
  • The sources report no casualty or heat-illness figures tied specifically to Friday's readings.

Why it matters

A confirmed 40 C-plus reading in the capital — only the second on record — signals extreme heat severe enough to strain power demand, agriculture and outdoor labor safety across a metropolitan area of roughly 10 million people.

Claims

  • ConfirmedSeoul's Nowon ward recorded 40.2°C at 3:28 p.m. on Aug. 7, 2026.
  • ConfirmedIt is the first time Seoul has recorded above 40°C since Aug. 1, 2018, when the city hit a record 41.8°C.
  • ConfirmedHanam's Deokpung district reached 40.7°C at 2:32 p.m., the highest nationwide reading that day.
  • ConfirmedNationwide average heat wave days since June 1 reached 14.8, the fourth-highest since 1973.
  • ConfirmedTropical nights this summer have reached a record 13 days nationwide.

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Why you can trust this story

71%

Source map · 2 outlets / 2 articles

How this credibility score is calculated

  • Source reliability
  • Corroboration
  • Primary source
  • Atom-verified claims
  • No contradiction
  • Settled
  • Claim attribution
  • AI disclosure

Atom-verified claims matched cited source text. Weights are fixed and explainable.

Human accountability

  • 2 independent origins / 2 sources
  • Drafted by the Newsmesis judgment agent (agent-cli); human approval required before publishing.

Verification ledger · 5

  • Claim: Seoul's Nowon ward recorded 40.2°C at 3:28 p.m. on Aug. 7, 2026.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one extracted atom matched cited source full text.

  • Claim: It is the first time Seoul has recorded above 40°C since Aug. 1, 2018, when the city hit a record 41.8°C.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one extracted atom matched cited source full text.

  • Claim: Hanam's Deokpung district reached 40.7°C at 2:32 p.m., the highest nationwide reading that day.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one extracted atom matched cited source full text.

  • Claim: Nationwide average heat wave days since June 1 reached 14.8, the fourth-highest since 1973.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one extracted atom matched cited source full text.

  • Claim: Tropical nights this summer have reached a record 13 days nationwide.
    Status: ConfirmedVerification trailVerifiedChecked by verification engine

    At least one extracted atom matched cited source full text.

Update log · 2
  • — Accessibility correction: heroImage.alt was a single string served to both editions, so the English edition described this image with the Korean headline's facts. Alt text is now per-locale and each edition is derived from its own headline; the stored ko alt already matched its headline and is unchanged. Operator note: O4: backfill per-locale hero alt on stories published before HeroImageAlt gained {en,ko}; regenerated from each edition's own headline (approval 33)
  • — Image correction: the stamped concept illustration concepts/markets.jpg (Markets / earnings / economy) did not match this story; the selector now picks concepts/heat-wave.jpg (Heat wave / extreme heat) and the hero was re-stamped. Operator note: Image correction 2026-08-31: concept selector fixed (bare beat match + negation); re-stamped stories whose hero asserted a topic the story denies or does not carry

AI accelerates. Humans approve.