Highest temperature in Hong Kong on August 17?

Platform comparison

Market context

On 17 August 2026, the Hong Kong Observatory will record a daily maximum temperature in Celsius, and this market settles to whichever range bracket contains that figure. The contract currently trades at 0% on Polymarket, meaning the crowd assigns negligible probability to any specific outcome materialising—a pricing anomaly typical of markets awaiting real-world data that hasn't yet occurred. Settlement depends entirely on the Observatory's published "Absolute Daily Max" figure, available only after the date passes and the agency finalises its Daily Extract dataset.

Hong Kong's August temperatures cluster tightly around historical norms. The Observatory's records show August daily maxima typically range between 31–33°C, with extreme readings above 34°C occurring in roughly one in five years during the month. The all-time August high stands at 36.3°C, recorded in 1990. Current market pricing reflects the absence of any forward-looking weather forecast specific enough to assign probability mass to particular ranges; traders cannot meaningfully price uncertainty about an event two years distant without meteorological data.

The critical catalyst is the Hong Kong Observatory's release schedule. The agency publishes daily weather summaries within 24–48 hours of observation, though the formal "Daily Extract" used for settlement may take longer to finalise. Traders should monitor whether any unusual atmospheric patterns develop in mid-August 2026—tropical cyclone activity, heat waves, or monsoon shifts—though such forecasts remain unreliable beyond 14 days. Until late July or early August 2026, conditional token holders have minimal information to distinguish between temperature brackets.

Methodology

We track Highest temperature in Hong Kong on August 17? 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

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 Kalshi UK. 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%.