Highest temperature in Hong Kong on August 16?

Platform comparison

Market context

The Hong Kong Observatory will record the highest temperature on 16 August 2026, with settlement contingent on the published daily maximum in degrees Celsius. The crowd currently assigns zero probability to any outcome, suggesting either insufficient liquidity or genuine uncertainty about which temperature band will materialise. August in Hong Kong typically sees daily maxima between 32–35°C, though extremes have reached 36–37°C during heat waves. The Observatory's historical data shows that mid-August temperatures cluster around 33–34°C in most years, with readings above 35°C occurring in roughly one year in five during this period.

The 0% implied probability reflects the market's nascent stage rather than any meteorological impossibility. Traders should monitor the Asian-Pacific weather patterns developing through July and early August 2026, particularly the positioning of the Pacific subtropical high-pressure system and any tropical cyclone activity in the region. The Hong Kong Observatory publishes extended forecasts ten days ahead; these will become actionable guides in the final fortnight before settlement. Recent August heat records in the region have coincided with weak monsoon conditions and stalled pressure systems, conditions that forecasters can identify weeks in advance. The settlement window closes at noon UTC on the resolution date, allowing traders to incorporate morning forecasts before final odds crystallise.

Methodology

We track Highest temperature in Hong Kong on August 16? 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 Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.