Lowest temperature in Hong Kong on August 11?

Platform comparison

Market context

Hong Kong’s official low on 11 August will be set by the Hong Kong Observatory’s **Absolute Daily Min** in degrees Celsius, and the current crowd price of **0% YES** implies the market is effectively treating a hit as impossible. For a weather contract like this, that usually means consensus is clustered around the hottest part of the summer range, with traders leaning towards a very ordinary overnight floor rather than an outlier cool spell; in that frame, the favourite is the higher-temperature band and the underdog is any sub-26°C print.

The historical anchor is straightforward: August in Hong Kong is typically warm, with the Observatory’s 1991–2020 normals showing an August 11 mean temperature profile that stays firmly in the mid-to-high 20s Celsius, while the 2023 monthly write-up says the Observatory’s minimum on 11 August 2023 was **25.7°C** under rain.[1][5] That makes low-end outcomes possible but uncommon, which is why a zero-per-cent YES price can still be read as a market saying “no value in the cool tail”. The contrarian angle is that the only real upside for a buyer comes if weather systems, cloud cover, or rain suppress the overnight minimum more than the consensus expects.

Traders should watch the Observatory’s daily readings page and the eventual Daily Extract, because the market cannot resolve until the finalized record is published.[4] Short-range forecast updates, thunderstorm warnings, or a tropical cyclone signal can matter because they change overnight cloud, wind, and rainfall expectations, but the final settlement still rests on the published Observatory minimum rather than forecast models.[9][10] In handicapper terms, the favourite remains a hotter band above the low 30s, while the value spot is any mispricing around a rain-cooled floor in the high 20s.

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

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

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.

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%.