Highest temperature in Seoul on May 30?

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Market context

Seoul's weather on 30 May 2026 will be measured at Incheon International Airport Station, with the settlement hinging on the single highest temperature recorded that day in Celsius. The 0% crowd probability suggests traders are either absent from this contract or systematically underweighting certain temperature ranges, a pattern worth examining against historical May conditions in the region.

Late May in Seoul typically sits within a 20–28°C range for daily highs, though outlier years have pushed into the low 30s. The Korea Meteorological Administration's 30-year climate normals show 30 May averaging around 24°C, with extreme highs recorded near 32°C during unusually warm springs. The current zero probability across all temperature brackets is unusual given the certainty that *some* temperature will register; this likely reflects thin liquidity rather than genuine trader conviction that conditions will be anomalous.

Traders should monitor spring 2026 weather patterns from March onwards, particularly any signals of an early heat wave or persistent cool-air masses over East Asia. The East Asian summer monsoon's onset timing—typically strengthening in June—can influence late-May conditions. Sea surface temperatures in the Yellow Sea and surrounding waters, tracked by regional meteorological services, serve as leading indicators for May heat. Wunderground's historical data for Incheon will be the sole arbiter; any discrepancy between other weather stations or reporting sources is irrelevant to settlement.

Methodology

This page reviews Highest temperature in Seoul on May 30? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Best Prediction Markets — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 Best Prediction Markets, 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.

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 fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within 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.