Highest temperature in Seoul (Incheon) on August 1?

Platform comparison

Market context

Polymarket is pricing the **highest temperature at Incheon Intl Airport Station** on 1 August at **0% YES**, so the contract is being treated as a near-certain miss on the upper ranges despite the live heat. The market settles off Wunderground’s daily high for the station, with conditional tokens on Polygon ultimately redeeming in USDC against that observed reading, so traders are really betting on where the airport’s official-style local maximum lands, not Seoul city centre or a broad regional forecast.

The historical frame is straightforward: Incheon usually runs cooler than inland Seoul, and August averages in the high 20s Celsius are more typical than the low-to-mid 30s seen in the current heatwave. Long-range climate guides put Incheon’s August average high around 29°C, while Seoul is also typically near 29–30°C, which makes a low-probability bin around the upper-30s or above hard to justify unless the air mass and cloud cover break badly in the airport’s favour.[4][17][20] Against that backdrop, the recent nationwide spike matters, but the gap between record headlines and the specific airport observation is usually where these range markets get misread.[1][12]

What traders should watch is the Korea Meteorological Administration’s short-range updates and any change in cloud, sea-breeze, or rainfall timing before the settlement window closes, because coastal stations can be capped even when inland cities run hotter.[5][11] Reuters reported South Korea’s heatwave intensifying after the country’s highest-ever reading of 41.4°C in Yangsan, and local coverage on 1 August showed Incheon already warm in the morning, but that does not guarantee a high-end airport reading later in the day.[12][16] For Polymarket users, the practical check is whether the airport’s daytime evolution on Wunderground tracks the same extreme pattern or reverts towards a more ordinary coastal August profile.

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 Polymarket Alternative UK, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Polymarket Alternative 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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.