Highest temperature in Hong Kong on July 16?

Platform comparison

Market context

Hong Kong’s July heat is a near-certainty, with the city routinely hitting 33–35°C under clear skies and high humidity. The market asks whether the peak temperature on 16 July 2026 will fall into a specific, undisclosed range, yet the crowd-implied probability sits at 0% YES, suggesting traders believe the outcome lies outside that band. This extreme pricing ignores the region’s consistent summer profile, where daily maxima rarely dip below 31°C even during cloudy spells.

Historical data from the Hong Kong Observatory shows that mid-July highs have averaged 34.2°C over the past decade, with peaks reaching 36.1°C in 2018 and 35.8°C in 2021. Comparable cases from 2023 and 2024 recorded 33.9°C and 34.5°C respectively, reinforcing that temperatures in the 33–35°C bracket are the statistical favourite. The 0% implied probability appears to be an underdog mispricing, creating value for contrarian traders betting the range aligns with the historical norm rather than an outlier.

Traders should monitor the Hong Kong Observatory’s Daily Extract for 16 July, which publishes the Absolute Daily Max once finalized. No weather announcements are scheduled before settlement, but tropical cyclone activity or sudden rain fronts could suppress temperatures below the expected range. A recent forecast from the Observatory notes stable subtropical conditions through mid-July, with no major disruptions anticipated [1]. The key dependency is the timely release of the official data, as the market cannot resolve until the Daily Extract is published.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, which mirrors the Polymarket order book directly.

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.

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.