Highest temperature in Seoul (Incheon) on August 18?

Platform comparison

Market context

Seoul's summer weather in mid-August typically sits at the peak of the monsoon season, with daily highs frequently exceeding 30°C. The Incheon International Airport meteorological station, which serves as the official observation point for this market, has recorded August 18th temperatures ranging from 26°C to 34°C across the past two decades, with an average high of approximately 30°C. The 0% crowd probability suggests traders are pricing in an outcome at one extreme end of the historical distribution—either an unusually cool day well below seasonal norms or a temperature threshold set so high that it falls outside plausible August conditions for the region.

Historical precedent matters considerably here. Incheon's August record high sits around 35°C, achieved during exceptional heat waves. The distinction between Weather Underground's Daily Observations table and the Day High & Low summary section occasionally produces minor discrepancies of 0.5–1°C, though these rarely alter the outcome category materially. Traders should monitor whether the market's probability reflects genuine uncertainty about the specific temperature band or instead reflects confusion about the resolution methodology itself.

The critical variable remains the exact temperature threshold embedded in the YES outcome range. South Korea's meteorological agency typically issues heat advisories when conditions approach 33°C, and such warnings would signal elevated risk of the market resolving affirmatively. Traders should track early-August 2026 weather patterns and any official forecasts released in the fortnight preceding August 18th, as these will provide the most reliable signal for seasonal positioning.

Methodology

Sports-specific comparison page for Highest temperature in Seoul (Incheon) on August 18?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

UK Frequently Asked Questions

When do sports markets resolve?

Typically within hours of the official final whistle. Polymarket uses UMA Optimistic Oracle with source URLs pointing at official league data feeds — e.g. the Premier League for EPL markets, UEFA for Champions League, FIFA for World Cup.

Can I bet on individual matches?

Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.

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%.