Highest temperature in Hong Kong on August 11?

Platform comparison

Market context

Polymarket is pricing the Hong Kong Observatory’s maximum temperature for 11 August as **0% YES**, which on the Polygon-based contract means USDC-linked conditional tokens are currently being treated as if the listed outcome ranges are effectively out of the money. For traders, the key point is not the headline heat but the exact settlement mechanic: the market resolves to the temperature band containing the Hong Kong Observatory’s *Absolute Daily Max (deg. C)* for that day, and the exchange will rely on the Observatory’s final Daily Extract rather than live forecasts or unofficial readings.[3][7]

That 0% reading sits in tension with Hong Kong’s mid-August climatology, where the Observatory’s 1991–2020 normals show an average daily maximum of **31.1°C** on 11 August, with the broader meteorological backdrop still squarely in peak summer heat.[2] Comparable recent outcomes matter more than the long-run average: Hong Kong has already seen extreme late-summer heat, including a record **36.9°C** at the Observatory during the current week, and nearby stations have run even hotter, which keeps the upper bins in play if the city remains under a strong heat dome.[5][13]

What a Polymarket user should watch today is the Hong Kong Observatory’s sequence of hourly readings, any local weather advisories, and the timing of the final Daily Extract publication, because this market cannot resolve until that data is posted.[11][14] Forecast pages currently point to a very hot, humid day with showers possible, and that combination often determines whether the day tops out in the low-30s or pushes into the mid-30s; the key dependency is whether cloud, rain, or a sea breeze trims the peak before the settlement cut-off at 12:00 UTC.[8][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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 PolyGram. 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%.