Highest temperature in Hong Kong on August 20?

Platform comparison

Market context

On 20 August 2026, the Hong Kong Observatory will record a daily maximum temperature in Celsius. The market currently prices all temperature ranges at 0% probability on Polygon, suggesting either technical settlement delays or minimal trading activity. Traders holding USDC on Polygon can enter positions across conditional token pairs representing discrete temperature bands, with final resolution dependent on the Observatory's published "Absolute Daily Max" figure to one decimal place once the Daily Extract is released.

Hong Kong's August temperatures cluster tightly around historical norms. The Observatory's records show August daily maxima typically range between 31–34°C, with extreme outliers rare. The all-time August record of 36.3°C (set in 1990) remains an outlier; most years see peak daily temperatures in the 32–33°C band. This consistency means the crowd's zero probability across all ranges reflects either market dysfunction or settlement uncertainty rather than genuine forecasting consensus. Comparable August days from 2015–2025 show no systematic drift toward hotter or cooler extremes.

The key dependency is the Observatory's publication schedule. The Daily Extract typically becomes available within 24–48 hours of the observation date, though delays occur during typhoon season or data-processing backlogs. Traders should monitor the Hong Kong Meteorological Society's seasonal outlook and any tropical storm activity in late August 2026, as extreme weather systems can push daily maxima outside the historical 31–34°C band. The settlement window closes at noon UTC on 20 August, creating a tight window for final data confirmation before conditional tokens resolve.

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 Polymarket Scam?, 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 Polymarket Scam?. 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.

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%.