Highest temperature in Hong Kong on August 16?

Platform comparison

Market context

Hong Kong's August heat will determine where the daily maximum temperature settles on 16 August 2026. The Hong Kong Observatory records absolute daily maxima to one decimal place, and this market divides the outcome into temperature bands. Current crowd pricing reflects genuine uncertainty about which range will capture the day's peak, with no single band commanding confidence at this distance from the settlement date.

August represents Hong Kong's hottest month climatologically, with daily maxima typically ranging between 31–33°C depending on monsoon patterns and tropical cyclone activity. Historical data from the Observatory shows considerable year-to-year variation; whilst most Augusts see peaks in the 32–34°C range, extreme heat events occasionally push readings above 35°C, particularly during high-pressure systems or ahead of typhoon passages. The 0% probability assigned to YES suggests traders are calibrating against specific temperature thresholds rather than dismissing the event's likelihood.

Traders should monitor the Asian summer monsoon's intensity and any tropical cyclone development in the Western Pacific during July and early August 2026, as both significantly influence Hong Kong's weather patterns. The Observatory's seasonal outlooks, typically issued in early August, will provide updated guidance on temperature expectations. Real-time tracking of upper-atmosphere pressure systems and sea-surface temperatures in the South China Sea will offer clearer signals as the settlement date approaches, with final resolution dependent on the Observatory's published daily extract for that specific date.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Prediction Today. 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%.