Highest temperature in Hong Kong on July 12?

Platform comparison

Market context

Hong Kong is bracing for mid-July heat as the city approaches its annual peak temperature window, with the Hong Kong Observatory set to record the day’s maximum Celsius reading by noon. The crowd-implied probability sits at 0% YES, suggesting consensus expects the highest temperature to fall outside the market’s defined range, likely below the threshold. Yet historical data reveals July is consistently Hong Kong’s hottest month, with record-breaking heatwaves in 2022 and 2024 pushing daily maxima to 35.7°C and 34.8°C respectively[1][2]. The 2022 July remains the hottest month since records began in 1884, indicating that extreme single-day spikes are not anomalies but embedded in the seasonal pattern[1].

Traders should monitor the Observatory’s daily extract for the “Absolute Daily Max” figure, which finalises settlement once published. Recent forecasts for July 2026 suggest daily highs between 30°C and 34°C (84°F–94°F), aligning with the long-term average high of 31.7°C for the month[4][8]. While no immediate weather announcements are scheduled, the key dependency is the timely release of the Daily Extract, which may lag if data validation is delayed. Given the 0% implied probability, the market appears to undervalue the likelihood of a heat spike exceeding the threshold, especially if cloud cover breaks or a subtropical ridge intensifies—a contrarian angle worth considering before settlement.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 12? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

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.

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 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.

Do I need to KYC for this market?

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

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.