Highest temperature in Seoul (Incheon) on August 17?

Platform comparison

Market context

Seoul's summer heat peaks in mid-August, with Incheon International Airport—the official measurement station for this market—typically recording daily highs between 28 and 32°C during this period. The 0% crowd probability suggests traders are pricing in either extreme confidence in a specific temperature band or uncertainty about which range will resolve. Historical August 17th data from Incheon shows variability: the station has recorded highs ranging from 26°C to 33°C on this date across recent decades, reflecting the influence of monsoon patterns and occasional tropical systems that can suppress or elevate temperatures unpredictably.

The critical distinction here lies in Weather Underground's Daily Observations table rather than the Day High & Low summary—a resolution rule that eliminates ambiguity but requires traders to verify against the primary source rather than relying on headline figures. Incheon's proximity to the Yellow Sea moderates extreme heat compared to inland Seoul, though August remains the warmest month. Traders should monitor the Korea Meteorological Administration's 10-day forecasts and any tropical cyclone activity in the Western Pacific during mid-August 2026, as these directly influence whether the station records typical seasonal highs or anomalous extremes.

Settlement occurs at 12:00 UTC on August 17th, 2026, giving traders a fixed window to assess actual conditions. The current 0% probability may reflect either that the crowd has already committed to a specific range or that liquidity remains sparse ahead of the event date. USDC settlement ensures direct on-chain resolution without intermediary conversion risk.

Methodology

This page reads Highest temperature in Seoul (Incheon) on August 17? 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

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

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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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