Highest temperature in Guangzhou on July 27?

Platform comparison

Market context

Guangzhou’s airport station needs to post the day’s *highest* temperature before the settlement window closes, so the relevant question is whether midday heating or cloud/rain suppression dominates the surface observations at Baiyun. Short-term guidance around the period points to very warm conditions, with forecast highs in Guangzhou reaching about 37°C and only limited cooling at night, which keeps the upper tail of possible outcomes firmly in the 30s Celsius.[1][2]

The current 0% crowd-implied probability for a YES outcome is only credible if traders are treating the market as badly mispriced or already assuming a bucket that looks out of reach. For a programmatic approach, the practical input is the station history page for Guangzhou Baiyun International Airport: the settlement source is a single daily maximum, so bots should key off the observed peak rather than any modelled daily average, and should update only when the Wunderground station record changes. In comparable hot-season Guangzhou setups, the market usually tracks the intraday maximum more than the evening forecast, because a brief late-morning spike can settle the range even if rain arrives later.[1]

For catalysts, the main variables are the synoptic rain-and-cloud pattern over Guangzhou, any timing shift in thunderstorms, and whether the airport station reports a brief extreme before convection builds. Forecast services currently show a mix of sunny and unstable conditions with possible rainfall in the coming period, which matters because cloud cover can cap the maximum while a late clearing can let temperatures jump quickly.[1] Traders using alerts, copy-trading, or conditional orders would typically watch successive forecast updates against the station’s live history page rather than rely on a single daily headline.[1][2]

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 Polymarket Bot 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 Polymarket Bot UK. 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.

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.