Highest temperature in Hong Kong on August 8?

Platform comparison

Market context

Hong Kong’s afternoon heat on 8 August is the real-world event here, and the market’s **0% YES** price leaves the **clear favourite** with a very strong presumption that the day will not deliver an outcome in the required temperature band. The official settlement source is the Hong Kong Observatory’s “Absolute Daily Max (deg. C)” for the date, so the only figure that matters is the final one-decimal Celsius maximum once the daily extract is published. August is normally hot in Hong Kong: the Observatory’s 1991–2020 normals put 8 August’s mean maximum at **31.7°C**, with the mean minimum at **26.9°C**, while a 2015 Observatory release shows an extreme of **36.3°C** on 8 August in the city, underlining that very high readings are possible but uncommon.[6][1]

From a handicapper’s angle, the crowd is effectively betting on an ordinary August outcome rather than a spike, and that is where the consensus sits. Recent August cases also support caution around blindly chasing heat: the Observatory described August 2024 as “an exceptionally hot August”, which tells traders that the upper tail can appear, but usually needs persistent sunshine, weak wind and limited rainfall to materialise.[20] With the market still unresolved before the daily extract is finalised, the main value question is whether the implied 0% is too dismissive of a late-day surge; contrarian buyers would be leaning on Hong Kong’s history of occasional record or near-record August highs, while the favourite remains any outcome short of an unusually hot, clear-sky afternoon.[1][20]

The key catalysts are the Observatory’s hourly readings through the day, weather warnings and any late updates in the local forecast, because cloud, showers or thunderstorms can cap the maximum well below the hotter historical band. The resolution cannot happen until the relevant “Daily Extract” is published on the Observatory’s climate archive, so traders need to watch for the finalised daily record rather than intraday headlines.[3] If the local forecast firms up around a high-30s reading, the contrarian angle improves; if showers or a tropical disturbance are in play, the underdog case weakens further.

Sources: 1 · 2 · 3 · 4 · 5

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.

UK Frequently Asked Questions

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.