Highest temperature in Hong Kong on July 13?

Platform comparison

Market context

Hong Kong is currently experiencing sunny conditions with a forecasted maximum of 35°C for 13 July 2026, yet the prediction market for the highest temperature on this specific date shows a 0% crowd-implied probability for the YES outcome [10]. On Polymarket, this contract trades as a conditional token on the Polygon network, settled in USDC, where the zero pricing suggests traders believe the official Hong Kong Observatory reading will fall outside the defined range entirely, despite the heatwave context [1][2].

Historical data frames this improbable pricing against a backdrop of record-breaking summer heat, with July recently confirmed as the city’s hottest month on record featuring the highest number of hot days [1]. While Sheung Shui recorded a blistering 39°C during a record July day in a previous year, the official observatory site typically records lower figures than rural outposts, with the hottest day of the year recently clocking 34.3°C at the main station [2][3]. The 0% probability likely reflects a mismatch between the specific temperature range offered and the Observatory’s typical daily maximum, which has historically peaked at 32.9°C for monthly means in July 2007 [4].

Traders must monitor the finalisation of the “Daily Extract” from the Hong Kong Observatory, which is the sole resolution source for the “Absolute Daily Max” figure [7]. The market cannot settle until this data is published, creating a dependency on the Observatory’s schedule rather than real-time weather fluctuations [7]. With the settlement window ending on 13 July 2026 at 12:00:00Z, the key catalyst is the official release of the finalized climatological data, which will override any preliminary tourist forecasts currently showing highs up to 35°C [5][10].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on July 13? 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 Kalshi UK, 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

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

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