Highest temperature in Seoul on July 31?

Platform comparison

Market context

At an implied **0% YES**, the market is effectively pricing the event as a near-certainty that Seoul’s peak temperature on 31 July will land outside the YES band, making **NO** the heavy favourite. That is a very hard line to justify on weather alone: Seoul’s July climatology is firmly summer-hot, with forecast services showing highs around the low-to-mid 30s Celsius for late July, including 33°C to 34°C type guidance for 31 July in some outlets.[1][10][11]

The comparable-case frame is straightforward. In late July, Seoul often sits in heatwave territory, and the Korea Meteorological Administration has recently warned that apparent temperatures across much of South Korea can exceed 35°C, while Seoul itself was forecast around 34°C in a recent national heat bulletin.[2][5] Against that backdrop, a 0% crowd line looks like a pure underdog setup: consensus is clearly that the day will be hot, but the value case depends on which exact temperature bucket the market uses and how sensitive the settlement is to a one- or two-degree miss versus the station’s observed high at Incheon Intl Airport.[1][2]

For catalysts, traders should watch the same-day evolution of cloud cover, sea-breeze influence, and any afternoon showers or thunderstorm complexes that can cap the maximum temperature, especially if moisture and convection build over the greater Seoul area.[2][4][5] The key dependency is not a formal announcement but the intraday weather setup feeding the airport station reading; if the morning starts already warm and skies remain clear, the favourite side strengthens, whereas early convection or rain would favour the underdog by trimming the day’s high.[2][4]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul on July 31? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win 2026, which mirrors 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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win 2026. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.