Highest temperature in Hong Kong on August 8?

Platform comparison

Market context

Polymarket is pricing this Hong Kong heat contract at **0% YES** right now, even though the live forecast points to a very hot day and the market still cannot settle until the Hong Kong Observatory publishes the final daily extract for 8 August 2026. On the on-chain side, that means traders are holding or unwinding **USDC** positions through **Polygon** using conditional tokens, with the payoff determined only after the Observatory’s “Absolute Daily Max” figure is posted in the relevant climatology record.

The historical frame matters because Hong Kong’s August climate is usually hot, humid, and unstable, but the market is not asking about an average day; it is asking for the single highest reading recorded by the Observatory station on the date. Seasonal references put August around a 29°C monthly mean, with daytime highs often in the low to mid-30s, and Hong Kong has also seen exceptionally hot Augusts in recent years.[12][16][17] That makes a 0% price look like a view that either the listed range is misread or the current market has not yet caught up with the live temperature setup.

For catalysts, traders should watch the Hong Kong Observatory’s afternoon updates, any late-day thunderstorm development, and the eventual publication of the “Daily Extract”, because settlement depends on the final official maximum rather than intraday forecasts.[3][6][11] Today’s HKO forecast calls for “extremely hot” conditions with temperatures of 28 to 35°C, while AccuWeather’s Hong Kong forecast shows a high around 97°F, or about 36°C, with spots of thunder later in the day.[2][6][11] That leaves the main dependency as whether the Observatory’s published maximum lands in the relevant temperature bucket once the day is finalised.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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%.