Highest temperature in Seoul on June 14?

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Market context

The settlement hinges on the highest temperature recorded at Incheon International Airport on 14 June 2026. Seoul's mid-June climate sits at the cusp of early summer, with average highs around 26–27°C, though heat waves can push readings substantially higher. The 0% crowd probability suggests traders are either absent from this market or treating the outcome as predetermined, which warrants scrutiny given the inherent variability of single-day temperature forecasts.

Historical data from Incheon shows June temperatures rarely exceed 30°C, with the station recording highs in the 28–29°C range most years during this period. Extreme heat events—those pushing above 32°C—occur but remain outliers in early June; late June and July are when sustained heat waves typically materialise across South Korea. The current consensus appears to be anchored to typical seasonal norms rather than accounting for the possibility of an anomalous warm system arriving mid-month.

Traders should monitor the Korean Meteorological Administration's forecasts as June approaches, particularly any signals of early heat waves or subtropical high-pressure systems moving northward. El Niño or La Niña conditions heading into northern hemisphere summer can influence regional temperature patterns. The settlement window closes at noon UTC on 14 June, meaning forecasts from the preceding week will carry material weight. Any value proposition depends on whether the crowd has underestimated the likelihood of above-average warmth for that specific date.

Methodology

We track Highest temperature in Seoul on June 14? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Where can I trade this market with the lowest fees?

On Who Will Win 2026, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Who Will Win 2026 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.

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.