Highest temperature in Seoul (Incheon) on August 8?

Platform comparison

Market context

The immediate change is that the latest forecasts keep **Seoul hot through the day**, with highs centred around **35–36°C** and only limited rain disruption, which leaves the market anchored to whether Incheon Airport actually prints a number in that band or briefly runs hotter. AccuWeather’s August outlook shows Seoul daily highs spanning **82° to 97°F** this month, while its day-ahead forecast for 8 August points to **97°F** with afternoon thunderstorms; Timeanddate and Wunderground are similarly aligned on a warm, showery setup rather than a cool-down.[1][2][3][11]

That matters because the current **0% YES** implied probability looks disconnected from the weather regime rather than from a clear cold signal. Early-August Seoul commonly sits in the low-to-mid 30s Celsius, and the Korea Meteorological Administration’s short-term forecast for the capital area called for **32–33°C** on 8 August, with heat and humidity persisting into the following days.[8][19] In a market resolved from Weather Underground’s **Daily Observations** at Incheon, traders should focus on whether the airport station’s realised high can reach the upper end of the expected range, especially if sunshine breaks through before any afternoon showers develop.[11]

The main catalysts to watch are the **hour-by-hour temperature trace**, the timing of **thunderstorms**, and any late forecast adjustments from local or commercial forecasters before the settlement window closes at noon UTC. Wunderground currently shows a mix of clouds and sun with a slight thunderstorm chance and a high around **95°F**, while Timeanddate’s hourly outlook peaks near **94°F** late morning and then eases later in the day.[7][11] If convection arrives early, it can cap the station’s maximum; if it holds off until after the peak heating period, the observing record has room to land in the higher temperature bracket.[2][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Prediction Today. 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%.