Highest temperature in Seoul (Incheon) on August 3?

Platform comparison

Market context

Polymarket is pricing this Seoul heat contract at **0% YES** right now, so the market is implying virtually no chance the Incheon Airport reading lands in a qualifying temperature band for 3 August. The trade settles in **USDC** on **Polygon** via **conditional tokens**, so the key question is not whether Seoul feels hot in general, but whether the official Wunderground high at Incheon Airport falls inside the exact bracket used for resolution.

That zero price sits against a distinctly hot early-August setup. Korean media quoted the Korea Meteorological Administration as expecting **Incheon around 34°C** and **Seoul around 37°C** on 3 August, with heatwave warnings in force and easterly winds helping push temperatures higher in the western part of the country.[3][1] More bullish forecasts for heat also put Seoul’s August highs broadly in the **low-to-high 30s Celsius**, which keeps the contract sensitive to any small shift in the airport’s actual maximum.[2]

For traders, the main catalysts are the short-range KMA updates, local thunderstorm or shower changes, and any cloud or wind adjustments that could cap the day’s peak before the settlement window closes at noon UTC. The market’s reference point is **Incheon Intl Airport Station**, so coastal moderation matters: if sea breezes or morning cloud linger, the airport can undercut inland Seoul by several degrees even on a very hot metropolitan day.[3][8]

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 Kalshi UK, 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.

FAQ

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 Kalshi UK. 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.