Pronóstico: Highest temperature in Hong Kong on July 9?

Platform comparison

Market context

The Hong Kong Observatory is set to record the absolute daily maximum temperature in degrees Celsius for 9 July 2026, a single data point that will resolve this prediction market contract. Today, Polymarket prices the YES outcome for any temperature range above the current threshold at 0%, implying the crowd believes the event is impossible under the current market structure. This on-chain contract, settled in USDC on the Polygon network using conditional tokens, reflects a stark disconnect between the zero probability and the region's typical July heat.

Historical patterns and seasonal forecasts frame this 0% probability as highly questionable. The Hong Kong Observatory’s seasonal forecast for July to September 2026 explicitly expects normal to above-normal temperatures, citing the latest ENSO status and climate model guidance [1]. AccuWeather data for July 2026 projects daily high temperatures ranging from 85°F to 95°F (approximately 29°C to 35°C), with an average high of 89°F (32°C) [3]. Given that July is historically one of Hong Kong’s hottest months, a zero probability for any significant temperature range contradicts decades of recorded climate data and current seasonal outlooks.

Traders should monitor the Hong Kong Observatory’s official "Daily Extract" publication schedule, as the market cannot resolve until this data is finalized. The specific catalyst is the release of the "Absolute Daily Max (deg. C)" figure, which will be measured to one decimal place [1]. While no immediate weather announcement has shifted the price recently, the forecast for the coming weekend indicates a temporary drop to 13°C–25°C, which may cause short-term volatility if traders misinterpret this as a trend rather than a transient dip [4]. The market’s resolution depends entirely on the finalised entry in the HKO’s climate database, making the timing of that publication the critical dependency for settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Hong Kong on July 9? 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

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.

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.