Highest temperature in Hong Kong on August 10?

Platform comparison

Market context

Hong Kong’s highest temperature on 10 August will be set by the Hong Kong Observatory’s final **Absolute Daily Max** for that date, not by any offshore station or citywide estimate. For a programmatic workflow, that means the cleanest approach is to poll the Observatory’s daily extract once it is published, map the one-decimal Celsius value into the market’s settlement bands, and ignore transient intraday spikes until the official file is finalised.

The current **0% YES** implies the market is treating the threshold for the relevant temperature range as effectively out of reach or already disfavoured, but August in Hong Kong can still produce sharp heat under compressed synoptic setups. The Observatory has logged very high late-summer readings before, including 34.4C on 10 August 2025 at the Observatory, while the city’s all-time official high reached 36.9C during a heatwave in August 2026, showing that the upper tail is real even if uncommon.[2][1] Seasonal normals for 10 August still point to a mean maximum around 31.4C, which is useful for calibrating automated models against the likely settlement bucket rather than the headline extreme.[4]

A trader watching this market should track three dependencies: the Observatory’s timing for releasing the daily extract, any heat or typhoon-related advisories that alter temperature dynamics, and the difference between the Observatory headquarters reading and hotter inland stations. Local reporting has shown that heat records can be set quickly when warm air is funnelled over the territory, but the market resolves only to the official Observatory figure, so scripts and copy-trading rules should key off that single source rather than forecast feeds from consumer weather services.[1][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on August 10? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

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%.