Highest temperature in Hong Kong on August 10?

Platform comparison

Market context

Hong Kong’s temperature profile has stayed firmly in the hot summer range over the last 24–48 hours, with recent observations around 91°F/33°C and a forecast for another very warm day near 97°F/36°C before any thunderstorm cooling kicks in.[1][6][12] That leaves the market anchored to a familiar late-summer pattern: hot, humid conditions are normal in August, with climatological mean maximums around 31.1°C and average daytime highs close to 30–31°C.[2][13][17]

For context, the Hong Kong Observatory’s own August records show that the date can still produce a wide spread of outcomes, from ordinary low-30s Celsius highs to much hotter spikes. The Observatory reported 34.4°C at the station on 10 August 2025, which was the month’s highest reading that year, while long-run August normals imply a typical maximum around the low 30s rather than the upper 30s.[11][2][15] In market terms, a 0% crowd-implied “YES” suggests traders are currently assigning little weight to an unusually high outcome, even though the climate background makes a mid-30s reading plausible on a clear, dry run of hours.[2][11]

The main catalysts are the day’s rain and thunder risk, because cloud cover and showers can cap the absolute maximum if they arrive early enough. AccuWeather’s Hong Kong outlook for 10 August points to a high near 97°F/36°C with thunderstorms, which is consistent with a potentially hot start but also a meaningful risk of afternoon suppression if convection develops.[6][16] Traders should watch the Observatory’s day-specific forecast updates and, later, the published Daily Extract, since settlement depends on the finalized “Absolute Daily Max (deg. C)” rather than any single daytime forecast.[3][14]

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 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%.