Highest temperature in Hong Kong on July 25?

Platform comparison

Market context

Hong Kong’s **highest temperature on 25 July** is trading like a clear favourite to land in a modestly warm band rather than a heat-extreme outcome, with the market implying just **2% YES** for the upper-side scenario. The current consensus sits around a typical late-July Hong Kong summer reading: one forecast for Saturday 25 July shows a high of **84°F (about 29°C)**, which is broadly consistent with the sort of daily maximum this market is likely to resolve against if conditions stay near model guidance.[1]

From a handicapper’s angle, that leaves the **underdog** side looking expensive only if the day turns materially hotter than forecast, while the **value** is more likely to sit with the lower temperature bands or a contrarian view that cloud, showers, or a sea breeze cap the maximum. Historical July norms for Hong Kong are already hot and humid, but not every day breaks higher into the sort of one-off spike that would force a settlement into the top end of the range; that makes the favourite dependent on a clean, sunny setup rather than a broad summer baseline.[2]

The main catalysts are straightforward: the Hong Kong Observatory’s final **Daily Extract** for 25 July, which is the settlement source, plus any late forecast shifts in cloud, rainfall, or wind in the run-up to the day. The market cannot resolve until the Observatory publishes the final data, so traders will be watching both the daytime forecast and the timing of the official release rather than any unofficial temperature feeds.[1]

Sources: 1 · 2

Methodology

We track Highest temperature in Hong Kong on July 25? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Who Will Win. 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.

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.