Highest temperature in Seoul on June 25?

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Market context

Seoul is bracing for its hottest June day in 52 years, with daytime highs on 19 June already reaching 35.6°C, a record not seen since 1958[2]. This extreme heat backdrop frames the current prediction market, where the crowd-implied probability for any temperature above 25°C sits at 0% YES, despite the city’s recent thermal surge. The consensus leans heavily toward cooler ranges, with 26°C and 27°C dominating Polymarket odds at 37% and 33% respectively[1], suggesting traders are underestimating the likelihood of a repeat of the 19 June peak.

Historically, June highs in Seoul average between 25°C and 29°C, rarely exceeding 31°C, though the 2026 spike to 35.6°C shatters that norm[3][5]. The value spot lies contrarian to the 0% YES probability: if monsoon rains fail to suppress heat before 25 June, temperatures could again breach 30°C, making the 0% line a mispriced underdog. Traders should watch the Korea Meteorological Administration’s July forecast, which cites a 40% chance of above-average temperatures and precipitation[2], and monitor real-time Wunderground data for Incheon Airport, the official resolution source[4]. Any delay in monsoon onset or a humidity surge could trigger a rapid re-rating toward the 26–28°C bands.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Who Will Win is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.