Highest temperature in Hong Kong on August 1?

Platform comparison

Market context

Polymarket currently prices this Hong Kong heat contract at **0% YES**, which on-chain means the market is assigning no value to the outcome via USDC-denominated conditional tokens on Polygon. The real-world event is the Hong Kong Observatory’s published **Absolute Daily Max (deg. C)** for 1 August 2026, and the market will only settle once that figure appears in the Observatory’s daily extract and is finalised. In practical terms, traders are not guessing an abstract “hot day” story; they are pricing a specific one-decimal Celsius reading from an official source.[3]

Historically, 1 August in Hong Kong is already a very warm benchmark date. The Hong Kong Observatory’s 1991–2020 normals show an average maximum of **31.6°C** for 1 August, while broader August summaries point to hot, humid conditions with frequent showers rather than a strong cooling trend.[1][18] Recent August data also supports the idea that high-30s is not required for a notable result: the Observatory recorded a **mean daily maximum of 32.3°C** in August 2024, above normal, and Hong Kong news reporting has described August as the city’s hottest month on average in record terms.[7][4] For a trader, that means the contract is really about whether the day’s peak lands in the Observatory’s published temperature band, not whether the month feels broadly hot.

The key catalysts are the Observatory’s day-by-day reporting timetable and any weather systems affecting southern China and the Pearl River Delta before the extract is locked in. Hong Kong’s summer temperatures can be pushed around by showers, thunderstorms, or cloud cover, but the market cannot resolve until the Observatory publishes the relevant daily extract for 1 August.[3] In hands-on Polymarket terms, that creates a straightforward dependency chain: forecast models and local weather alerts may move expectations during the session, but only the official Hong Kong Observatory record will determine the USDC settlement outcome on Polygon.[3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Hong Kong on August 1? 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 Polymarket Alternative 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 Polymarket Alternative 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.

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.

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.