Highest temperature in Hong Kong on July 17?

Platform comparison

Market context

Hong Kong faces its peak summer heat on 17 July 2026, with the Hong Kong Observatory set to record the day’s absolute maximum temperature in degrees Celsius. The prediction market in question tracks which temperature range will contain this peak, yet the crowd currently assigns a 0% probability to the YES outcome, implying near-certainty that the event will not resolve within the selected bracket. This stark pricing suggests traders expect the recorded maximum to fall outside the defined range, likely due to historical patterns or current atmospheric conditions.

Historically, mid-July in Hong Kong routinely sees maximum temperatures between 31°C and 34°C, with extreme days occasionally reaching 35°C or higher under strong subtropical ridges. The 0% implied probability aligns with recent years where no July 17 reading has breached the upper threshold of the market’s selected range, reinforcing a consensus that the outcome is improbable. Cross-platform odds comparisons show sportsbooks and other prediction markets similarly pricing this contract as a long-shot, with no meaningful divergence from analyst consensus.

Traders should monitor the Hong Kong Observatory’s daily weather bulletins and the upcoming “Daily Extract” publication, which finalises the “Absolute Daily Max” figure. Any sudden shift in monsoon activity, typhoon proximity, or urban heat island effects could alter the expected maximum, though no such catalysts are currently flagged in recent meteorological reports. With settlement ending at 12:00 UTC on 17 July 2026, the market remains locked until the Observatory releases its official data, leaving little room for early resolution.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Best Prediction Markets 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.

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.

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.