Highest temperature in Hong Kong on August 12?

Platform comparison

Market context

On 12 August 2026, the Hong Kong Observatory will record the day's highest temperature in degrees Celsius, measured to one decimal place. The market currently prices at 0% YES across all temperature bands, reflecting the settlement window's future date and the absence of real-time data. Traders are pricing conditional tokens on USDC via Polygon, with resolution contingent on the Observatory's official "Daily Extract" publication—a dataset that typically becomes available within days of the observation date.

Hong Kong's August temperatures have historically clustered between 29°C and 35°C, with extreme heat events pushing toward 36–37°C on rare occasions. The city's record August daily maximum stands at 36.6°C (set in 2015). Current market pricing at zero probability across all bands suggests either technical factors (the market may not yet display live odds) or that traders are awaiting closer proximity to the date before committing capital. Historical volatility in summer extremes—driven by tropical cyclone activity and monsoon patterns—means August outcomes span a wider range than spring or autumn months.

The Hong Kong Observatory publishes daily climate data through its Climate Information Services portal, with finalised records typically released within 48 hours. Traders should monitor tropical cyclone forecasts from late July onwards, as these systems significantly influence August temperatures; the Western Pacific typhoon season peaks in August and September. Additionally, any unusual atmospheric patterns flagged by regional meteorological agencies in early August could shift expectations for that specific date's maximum temperature.

Methodology

We track Highest temperature in Hong Kong on August 12? 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%.