Highest temperature in Seoul on July 9?

Platform comparison

Market context

Seoul on 9 July 2026 is entering the peak of its monsoon season, where July is typically the rainiest month in South Korea, yet recent days have shattered historical heat records. Just yesterday, 8 July, hit 37.8°C, marking the hottest early-July day ever recorded in the country, a stark contrast to the current market pricing of 0% YES for any temperature above 30°C. This pricing ignores the fact that Seoul’s July highs usually range between 21°C and 28°C, but with humidity levels exceeding 80%, the heat can feel like over 34°C, and record-breaking heatwaves have pushed temperatures to 40°C in western cities recently.

The market’s conditional tokens on Polygon, settled in USDC, are currently mispriced against the catalyst of an ongoing, unprecedented heatwave that has already triggered Seoul’s first city-wide heat warning. Traders must monitor the Korea Meteorological Administration’s short-range forecasts, which currently predict a maximum of 32°C for the day, but the recent streak of 37°C+ days suggests this could be a false low. The dependency on Wunderground’s official data for the Incheon Intl Airport Station is critical, as even a single hour of extreme heat could resolve the market, and meteorologists warn this summer could be Korea’s hottest yet, with temperatures hitting 37.1°C on Tuesday, the hottest July day since 1908.

Historical data shows that while average highs are around 26°C, the recent anomaly of 37.8°C on 8 July indicates a volatile shift that the 0% probability fails to capture. The market’s USDC settlement window ends on 9 July 2026 at 12:00 UTC, meaning any temperature spike before noon will resolve the contract. With the Sinchon Water Gun Festival occurring later in July, the current heat is an isolated but extreme event, and the recent news of record temperatures in western cities suggests the Incheon station could also experience similar extremes, making the current pricing a significant risk for traders.

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Methodology

This page reviews Highest temperature in Seoul on July 9? 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 Polymarket Scam?, 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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Scam? 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.