Highest temperature in Seoul (Incheon) on August 8?

Platform comparison

Market context

The market is pricing a **0% YES** chance that Incheon Airport’s recorded daily high on 8 August lands in the selected temperature band, which leaves the field as a strong favourite for the opposing side. In plain weather terms, that sits against a very hot August setup: Seoul forecasts cluster around the mid-30s °C on local sources, with highs of about 35°C to 35°C+ and intermittent showers or thunderstorms flagged through the day.[2][3][6][10] That combination keeps the upside live for a hot reading, but the resolution source matters: the contract settles on the highest value in Weather Underground’s *Daily Observations* table, not the summary high/low line, so traders should care about the exact observed peak rather than the headline forecast.[10]

Historically, Seoul’s August is one of the warmest parts of the year, with climate pages describing it as the hottest month and daily highs commonly around 30°C or above, alongside high humidity.[16][19] That framing makes a sub-30°C result look like the contrarian angle if cloud cover or rain suppresses the afternoon peak, while anything near the mid-30s would support the consensus that this is a heat-leaning day.[1][3][11] The present implied probability near zero suggests the market is already leaning hard against the selected band; the value spot, if any, is in the weather not clearing into the forecasted heat.

The key catalyst is the actual intraday evolution at Incheon: whether showers or thunderstorms arrive early enough to cap the high, or whether breaks in cloud allow a proper afternoon spike.[2][7][10] Current forecasts differ slightly on timing and intensity, but they agree on a warm day with precipitation risk and a chance of thunderstorms, so the late-morning to afternoon window is the one to watch.[2][3][6][7] Since settlement depends on the *daily observations* table, a trader should track the station’s observed hourly maximum, not just the forecast high, because a brief spike can decide the market even if the rest of the day looks cooler.[10]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul (Incheon) on August 8? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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%.