Highest temperature in Seoul on May 23?

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Market context

Seoul's weather on 23 May 2026 will depend heavily on whether the Korean peninsula sits within a warm air mass or remains under cooler maritime influence during late spring. The settlement window closes at midday local time, capturing only the morning and early afternoon peak—a critical constraint since Seoul's diurnal temperature swing in May typically ranges 8–12°C. No significant weather pattern shifts have emerged in the past 48 hours that would alter the seasonal baseline for this date.

Historical May temperatures at Incheon International Airport show a median high of 23–24°C, with the 90th percentile reaching approximately 28°C. Extreme outliers—days exceeding 30°C in May—occur roughly once every 5–7 years and require either an early-season heat dome or warm southwesterly flow from the Pacific. The 0% crowd probability suggests traders are pricing in below-median conditions, though this may reflect uncertainty about which specific temperature bracket the market offers rather than genuine conviction about cool weather.

The primary catalyst remains the East Asian weather pattern in early-to-mid May 2026, particularly whether the North Pacific high-pressure system extends northwestward into the Korean peninsula or retreats eastward. Traders should monitor seasonal forecasts from the Korea Meteorological Administration and any anomalies in sea-surface temperatures across the Yellow Sea, which can suppress or amplify warming. The settlement depends entirely on Wunderground's historical data for Incheon station, making data availability and station continuity the only operational risk.

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

Where can I trade this market with the lowest fees?

On PolyGram, 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?

PolyGram 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, PolyGram triggers a quick verification flow that finishes in minutes.