Highest temperature in Seoul (Incheon) on August 8?

Platform comparison

Market context

Polymarket currently prices this contract as a near-dead market, with the crowd-implied probability at **0% YES**, even though the paid-out position is settled in **USDC** on **Polygon** through conditional tokens rather than by any discretionary judgement. The real-world event is the highest temperature recorded at **Incheon Intl Airport Station** on 8 August, and the resolution source is the **Weather Underground Daily Observations** table, not the summary high/low box, so traders are effectively forecasting a single station-day maximum rather than broad Seoul-area heat.[6][12]

That 0% reading sits against a backdrop of extreme heat across South Korea this week. Reuters reported a national record of **42.5°C** in Yangsan on 3 August, while Korean outlets said Seoul reached **39.9°C** and then **40.2°C** at AWS sites on 6–7 August, underscoring how quickly late-summer maxima can overshoot forecasts.[16][2][4] For a late-August weather market, the relevant comparison is not the city average but the upper tail of hot, stagnant air masses: Incheon’s airport station can still print materially below inland Seoul on some days, yet a strong heat dome or downslope flow can lift it into the mid-30s, which is why recent model-consensus language around **34–36°C** matters even when the live market is unmoved.[6][10]

The key catalysts are the **Korea Meteorological Administration short-range forecast**, any same-day heat advisories, and the timing of hourly observations that feed Weather Underground’s daily record.[9][10][6] Traders should also watch for rain bands, sea-breeze shifts, or cloud cover around the airport, because those can cap the daily maximum even when inland districts stay sweltering. With the settlement window closing at **12:00 UTC**, the last published observations before the next date’s first datapoint are the ones that matter for resolution.[6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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

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.

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%.