Highest temperature in Seoul (Incheon) on August 17?

Platform comparison

Market context

Seoul's weather on 17 August 2026 will be measured by the highest temperature recorded at Incheon International Airport's meteorological station that day, resolved via Weather Underground's Daily Observations table rather than summary figures. The current Polymarket pricing reflects 0% probability across all temperature bands, suggesting either extreme uncertainty about available liquidity or that traders view the event as too distant for meaningful calibration. USDC settlement on Polygon will execute once Weather Underground publishes the official daily maximum, with conditional tokens determining payouts based on which temperature bracket captures the actual high.

Seoul's August climate is remarkably consistent year-on-year. Historical data from the past two decades shows daily highs in mid-August cluster between 28°C and 32°C, with extreme readings above 35°C occurring roughly once per decade during heat waves. The 2018 heat wave pushed temperatures to 39.6°C in Seoul proper, though Incheon Airport—situated on the coast—typically records 2–3°C lower maxima than central Seoul due to maritime influence. This geographical distinction matters for resolution accuracy, as the airport station's readings tend toward the cooler end of Seoul metropolitan area observations.

Traders should monitor tropical cyclone forecasts from June onwards, as typhoon season can suppress August temperatures significantly or, conversely, create pre-storm heat spikes. The Korea Meteorological Administration publishes seasonal outlooks in May that often signal whether an El Niño or La Niña pattern will influence East Asian summer temperatures. Current long-range models remain too uncertain at this distance to price meaningful probabilities, explaining the flat market structure.

Methodology

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

UK Frequently Asked Questions

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 Polymarket Scam?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

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.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.