Highest temperature in Seoul (Incheon) on August 10?

Platform comparison

Market context

Incheon Airport’s late-morning reading is the figure that settles this contract, so the relevant event is the day’s **peak temperature** at the station rather than a generic Seoul city forecast. With the crowd currently pricing **0% YES**, the market is effectively saying that none of the listed Celsius bands looks likely at present, which leaves room for a sharp repricing if the airport clears an adjacent threshold by even a small margin.

August in the Seoul metropolitan area is normally the hottest part of the year, and the published outlook for 10 August points to a high around **34°C** for Incheon, with Seoul forecasts also sitting in the low-to-mid 30s and conditions described as hot and mostly cloudy.[3][17] Recent regional heat has been extreme: South Korea has already logged record-breaking August temperatures this month, including readings above 40°C in the south, while Seoul itself has seen 39.6°C in past heat events.[15][9] That history matters because prediction markets on temperature often cluster around forecast maxima, then jump if late-afternoon insolation or weak maritime cooling pushes the final observation above model guidance.

Traders should watch the Korea Meteorological Administration’s short-range updates, especially any change in cloud cover, rainfall timing, or marine air flow into Incheon, because the airport sits close enough to the coast for sea breeze effects to cap the high. The on-chain mechanics are simple: positions settle in **USDC**, so the practical trade is whether the final Wunderground daily observation lands inside one Celsius bucket or the next, with the first published data for the following day closing the record window.[3] In crypto terms, there is no obvious BTC or ETH macro driver here unless broader risk sentiment is moving the market enough to change liquidity conditions or widen spreads, but the contract itself will still resolve on the weather print, not exchange chatter.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

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Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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?

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