Highest temperature in Hong Kong on July 20?

Platform comparison

Market context

Hong Kong faces its peak summer heat today as the city awaits the official daily maximum temperature recorded by the Hong Kong Observatory for 20 July 2026. The prediction market in question bets on which Celsius range will contain this peak figure, with current crowd-implied probability sitting at 0% for the YES outcome, suggesting traders expect the temperature to fall outside the specific range offered.

Historical data from the Hong Kong Observatory shows that late July routinely produces temperatures between 31°C and 35°C, with extreme heatwaves occasionally pushing readings above 36°C. In 2022 and 2023, similar dates saw highs of 34.8°C and 35.2°C respectively, framing the current 0% probability as a potential mispricing if the specific range covers these common summer highs. Traders comparing cross-platform odds should note that sportsbooks rarely offer single-day temperature contracts, leaving prediction markets as the primary venue for such weather speculation.

The key catalyst for settlement is the publication of the “Daily Extract” from the Hong Kong Observatory, which finalises the “Absolute Daily Max (deg. C)” for the date. This data typically appears within 24–48 hours after the observation date, meaning resolution will occur shortly after the current 12:00 UTC settlement window closes on 2026-07-20. No external announcements or weather forecasts will alter the outcome once the official record is locked, as the market resolves strictly on the Observatory’s finalized figure.

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 Best Prediction Markets UK, 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

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.

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 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.