Lowest temperature in Hong Kong on August 6?

Platform comparison

Market context

Hong Kong’s overnight low on 6 August is usually decided in a narrow summer band, with the Hong Kong Observatory’s August normals putting the mean minimum at **26.8°C** and the mean temperature at **28.9°C** for the date, so the market’s **0% YES** implies the crowd sees virtually no chance of an unusually cool reading.[1][13] In handicapper terms, the favourite is the warmer cluster around the high-20s, while the only real underdog angle is a one-off dip from rain-cooled air or an early monsoon surge. Historical August averages also point to a sticky baseline: third-party climate summaries commonly place Hong Kong’s August low near **26–27°C**, with record lows in the low 20s rather than anything close to freezing or even mid-teens.[3][8]

That leaves value, if any, in contrarian temperature bands rather than an outright cold outlier. The key read is that this is a daily minimum, not a daytime high, so an early-morning rain band, thicker cloud cover, or a locally stronger easterly can shave a degree or two off expectations without changing the broader seasonal setup.[1][11] The Hong Kong Observatory’s climatological page confirms the resolution source and rounding to one decimal, so traders will be waiting for the final Daily Extract rather than informal station data.[13] With settlement only after the 6 August extract is finalised, the main dependency is the Observatory’s publication timing; until then, consensus should stay anchored to the usual August warmth unless the overnight synoptic pattern materially weakens.[2][4]

Sources: 1 · 2 · 3 · 4 · 5

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 Who Will Win. 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%.