Highest temperature in Seoul (Incheon) on August 14?

Platform comparison

Market context

On 14 August 2026, the highest temperature recorded at Incheon International Airport Station will determine the settlement outcome for this market. The crowd currently assigns zero probability to any outcome occurring, a reflection of the market's nascent stage rather than genuine certainty about Seoul's August weather. Resolution hinges on the Daily Observations table from Weather Underground, not the summary figures, creating a technical distinction that occasionally matters when stations report conflicting data.

Seoul's August temperatures cluster predictably around 28–32°C, with extremes reaching 34–35°C during heat waves. Historical data from the Korea Meteorological Administration shows that temperatures exceeding 33°C occur in roughly one-third of August days during typical years, whilst readings above 35°C remain relatively rare but not exceptional. The 2018 heat wave pushed Seoul to 39.6°C, establishing that extreme outcomes are plausible within the broader East Asian monsoon context. Current zero probability reflects the market's illiquidity rather than any meteorological reasoning.

Traders should monitor the Western Pacific subtropical high-pressure system's positioning in late July and early August 2026, as this drives Seoul's summer temperature regime. The Korea Meteorological Administration typically issues heat-wave forecasts 7–10 days in advance; any official warnings for mid-August would signal elevated odds for higher temperature brackets. El Niño or La Niña conditions developing through 2025–2026 could influence regional atmospheric patterns, though their predictive power at this distance remains limited. The market's zero reading presents an obvious liquidity opportunity rather than a genuine forecast.

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 Who Will Win. 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%.