Highest temperature in Seoul on July 23?

Platform comparison

Market context

Polymarket’s contract is pricing the day’s Seoul heat close to the high-20s Celsius, with **27°C** leading at **49%** and **28°C** next at **30%**, so the market is treating a mid-range summer high as the most likely settlement zone today.[1] Because this market resolves off the **highest temperature recorded at Incheon Intl Airport Station** on 23 July 2026, traders are really handicapping the day’s maximum reading rather than the city’s broader headline weather.[1]

That framing matters because Seoul’s July climate is already warm and humid: typical July highs are about **28°C**, with average rainfall and only partial sunshine limiting the chance of extreme heat on any given day.[2] For a Polymarket user, the contract is a standard **USDC**-settled position on **Polygon**, with the outcome represented by conditional tokens, so the practical question is whether the airport station prints a clean 27–28°C top reading before the settlement window closes.[1][2]

What moves the price from here is the intraday weather setup: cloud cover, rain bands, and the timing of any warm afternoon break are the main catalysts, not long-range seasonal averages. The key dependency is the station’s official Wunderground history page, because a late-morning or early-afternoon spike can shift the highest recorded temperature into the next bracket even if the rest of the day is muted.[1]

Sources: 1 · 2

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 PolyGram, 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 PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.