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. This market invites traders to predict which temperature range will contain that single measurement. A YES share represents a bet that the actual maximum falls within a specified bracket; a NO share bets it falls outside. The Observatory publishes these daily maxima to one decimal place in its official climate records, which serve as the binding resolution source once finalised.

Hong Kong's August climate is characterised by intense heat and high humidity, with historical daily maxima typically ranging from 31°C to 34°C. The territory's record August maximum stands at 36.6°C, set in 2015. Recent decades show August averages clustering around 32–33°C, though individual days frequently exceed 34°C during the month's peak heat. The current crowd-implied probability of 0% for any single range suggests either extreme confidence in a particular outcome or insufficient trader participation at present. Examining historical volatility across August dates reveals that anomalous heat events do occur but remain statistically uncommon.

The Hong Kong Observatory updates its climate database on a fixed schedule following each calendar day's close. Traders should monitor the Observatory's official website for publication of the "Absolute Daily Max" entry for 12 August 2026 in the relevant daily extract. Broader weather patterns—including tropical cyclone activity, monsoon shifts, or unusual high-pressure systems affecting the region in early August 2026—may influence the eventual reading. Resolution cannot occur until the Observatory has published and finalised its data for that specific date.

Methodology

This page reviews Highest temperature in Hong Kong on August 12? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Market UK, which mirrors the Polymarket order book at 0% fees.

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 Market UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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%.