Highest temperature in Hong Kong on July 25?

Platform comparison

Market context

Hong Kong’s hottest reading on 25 July will be set by the Hong Kong Observatory’s daily maximum, and the market is currently pricing a fairly tight band rather than a broad heat-wave outcome. On Polymarket, 33°C and 34°C are the joint leaders at 32% each, with the surrounding 32–34°C cluster accounting for more than 90% of implied probability, while the crowd-implied chance of a 2% YES on the specific contract suggests the market is treating the exact settlement threshold as a long shot.[1]

That pricing sits close to seasonal comparables. WeatherSpark says Hong Kong’s average daily high in July is about 32°C, with 25 July itself also averaging 32°C, and temperatures are described as usually staying between 29°C and 34°C.[2] Travel China Guide likewise puts Hong Kong’s July average high at 32°C, noting the month is hot, humid, and often affected by rain, which can cap extremes even when the broader summer pattern is warm.[3] In other words, the current line-up implies a normal-to-slightly-above-normal day rather than an exceptional spike, which is consistent with the narrow spread in the platform’s outcome prices.[1][2]

For traders, the key catalysts are the Hong Kong Observatory forecast updates, any last-minute changes in cloud cover or rain intensity, and the final daily extract after the settlement date, since the market cannot resolve until the Observatory publishes the official “Absolute Daily Max” figure.[1] Because the window closes at 12:00 UTC, intraday heat later in the Hong Kong afternoon still matters, so late model runs and morning synoptic changes can move pricing quickly. The main cross-platform divergence to watch is whether sportsbook-style weather specials, if available, remain anchored to a single threshold while the prediction market continues to distribute probability across adjacent temperatures; at present, the crowd signal looks internally consistent rather than split.[1]

Sources: 1 · 2 · 3

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

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.

Do I need to KYC for this market?

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