Highest temperature in Seoul (Incheon) on August 15?

Platform comparison

Market context

Seoul's maximum temperature on 15 August 2026 will be measured at Incheon International Airport Station and resolved against Weather Underground's Daily Observations table rather than its summary figures. The market currently prices this outcome at 0% YES on Polygon, suggesting traders believe the specified temperature threshold sits above Seoul's realistic August ceiling. Settlement occurs at 12:00 UTC on the resolution date, creating a hard deadline for the highest recorded reading across the full calendar day.

Seoul experiences peak summer heat in mid-August, with historical August averages near 29°C and daily maxima frequently exceeding 33°C during heat waves. The city recorded 39.6°C on 8 August 2023 during an exceptional heatwave, whilst typical mid-August highs cluster between 32–35°C. The 0% pricing suggests the market has set a threshold substantially above these norms—likely 40°C or higher—making resolution dependent on extreme conditions rather than routine summer temperatures. Incheon Airport's coastal location moderates temperatures slightly compared to central Seoul, typically running 1–2°C cooler than downtown readings.

Traders should monitor long-range weather forecasts from late July onwards, particularly the Korean Meteorological Administration's outlooks for August 2026. Pacific typhoon activity and monsoon patterns significantly influence Seoul's August weather; early-season tropical systems can suppress temperatures, whilst high-pressure systems from the Tibetan plateau drive exceptional heat. The specificity of using Daily Observations data rather than summary highs matters operationally—intraday temperature spikes recorded at any point during 15 August count, not merely the official daily maximum reported in standard weather summaries.

Methodology

We track Highest temperature in Seoul (Incheon) on August 15? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 PolyGram. 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.

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%.