Highest temperature in Seoul on June 20?

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Market context

Seoul’s airport high for 20 June is the figure that matters here, and the market is pricing only **1%** for the **YES** side, so the crowd is effectively saying a top-end outcome is a longshot. For a June daily high at Incheon International Airport, the base case is a warm-but-not-extreme summer afternoon rather than a record spike, which makes the consensus clearly towards a middling temperature band.

The historical frame is straightforward: June in Seoul typically produces highs in the high 20s to low 30s Celsius, with extremes above the mid-30s reserved for unusual early-summer heat events[3]. Korea has, however, shown it can jump sharply into record territory, including Seoul’s 35.6°C June high reported in a recent hot spell and South Korea’s 41.0°C national all-time record at Hongcheon[1][2]. That leaves the favourite as a non-extreme, upper-middle temperature band, while the underdog is any outcome that pushes the airport station into the hottest tail of the distribution. On that framing, the market’s 1% implies the consensus is already close to pricing the “normal hot June day” outcome, with value only if a trader thinks a broader regional heat surge can reach the airport too.

The main catalysts are the weather pattern over the Korean peninsula, especially the arrival of an early heat ridge or pre-monsoon warmth, plus any cloud, rain, or sea-breeze moderation affecting Incheon’s coastal airport location. The settlement uses Wunderground’s daily high for Incheon Intl Airport Station, so the key dependency is the highest observed temperature during the full local-day window rather than a city forecast headline[market description]. Short-range forecast updates from providers such as AccuWeather point to June highs in Seoul broadly in the mid-20s to high-20s Celsius rather than anything exceptional, which reinforces the underdog status of a very hot outcome[7].

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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 fast are USDC deposits?

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Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Who Will Win 2026 triggers a quick verification flow that finishes in minutes.