Highest temperature in Seoul (Incheon) on August 11?

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Market context

Seoul's summer heat peaks in August, with daily maxima typically ranging from 28–32°C at Incheon International Airport, the official observation point for this market. The 0% crowd probability suggests traders are either pricing in exceptionally cool conditions or treating the market as illiquid; historical August data shows temperatures below 25°C occur fewer than 5% of the time at this station, making the lowest resolution brackets statistically improbable. August 11th falls within the core monsoon season on the Korean peninsula, when tropical air masses dominate and afternoon highs routinely exceed 30°C unless a rare cold front or typhoon system disrupts the pattern.

Resolution hinges on Weather Underground's Daily Observations table at Incheon, not the summary high-low figures, creating a technical dependency that traders must verify before settlement. The distinction matters: sub-hourly logged temperatures occasionally diverge from rounded daily summaries, particularly during rapid pressure changes or sensor recalibration. Traders should monitor Korea Meteorological Administration (KMA) forecasts in late July and early August 2026 for any anomalous patterns—tropical cyclone activity, upper-level troughs, or blocking highs—that would shift the distribution meaningfully. USDC settlement occurs post-12:00 UTC on August 11th, giving the market a hard close once Incheon's final observation is logged.

Methodology

This page reads Highest temperature in Seoul (Incheon) on August 11? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

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USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

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UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

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