Highest temperature in Seoul (Incheon) on August 8?

Platform comparison

Market context

Polymarket is pricing the Seoul/Incheon airport temperature contract at **0% YES**, which means the USDC market on Polygon is still treating a qualifying high in the specified Celsius band as effectively absent even though the day is already under way. For settlement, what matters is the Weather Underground **Daily Observations** table for Incheon Intl Airport Station, not the platform’s headline day-high figure, so traders should focus on the observed hourly readings rather than the broader forecast tiles.

That 0% reading sits against a weather setup that is plainly hot enough to keep the upper ranges in play. Forecasts and current conditions for Seoul point to highs around the mid-to-upper 30s °C, with AccuWeather, Timeanddate and Weather Underground all showing severe heat and a chance of showers or thunderstorms rather than a cool-down. In comparable summer heat events, these contracts tend to move only when the observed airport station data confirms whether the peak actually reached the next bracket, which is why a low quoted probability can persist until the decisive hour lands in the historical record.

A trader watching this market should pay attention to the airport station’s observation cadence, because the contract resolves from the recorded daily maximum rather than expectations. The main catalysts are therefore the midday-to-afternoon temperature prints, any thunderstorm-driven suppression of the peak, and whether later updates on Weather Underground revise the station’s daily observations before the settlement window closes. The forecast sources currently suggest heat holds through the afternoon, but the on-chain token only settles once the Wunderground record at Incheon makes the outcome unambiguous.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Seoul (Incheon) on August 8? 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

UK Frequently Asked Questions

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.