Highest temperature in Hong Kong on July 11?

Platform comparison

Market context

Hong Kong faces its peak summer heat today as traders assess the likelihood of the city’s highest temperature on 11 July 2026 landing in a specific Celsius range. The market currently implies a 0% probability for the “YES” outcome, suggesting the crowd believes the event will not occur under the defined conditions, though Polymarket data shows 34°C as the frontrunner at 41%, with 35°C at 27% and 33°C at 23% [1].

Historical records frame this as a high-heat contest where 34–35°C is the expected favourite, not an underdog. July 2024 was the city’s hottest month on record, with an average of 30.3°C and 11 broken temperature records, while July 2025 saw maxima near 35°C on several days, including 34.3°C on 7 July [2][4]. The all-time highest monthly maximum for July since 1885 is 35.7°C, indicating that temperatures above 34°C are well within the realm of normal summer variability rather than outliers [3].

Traders should monitor the Hong Kong Observatory’s Daily Extract for the “Absolute Daily Max” once finalized, as settlement depends entirely on this official figure [1]. No external announcements or schedules drive this outcome; the sole catalyst is the observatory’s data release, which typically follows the end of the measurement day. With AccuWeather forecasting daily highs of 86–94°F (30–34°C) for July 2026, the consensus leans toward 34°C, but value may sit contrarian at 35°C if cloud cover or rainfall patterns shift unexpectedly [5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Who Will Win 2026. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 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.