Highest temperature in Hong Kong on August 7?

Platform comparison

Market context

Hong Kong’s official forecast points to a very hot day, with the Hong Kong Observatory saying the maximum temperature will be around 34°C in urban areas and a couple of degrees higher in the New Territories, with temperatures over parts of the New Territories reaching 36°C or above over the weekend. That keeps the **favourite** on the higher brackets rather than the lower ones, even though the market’s crowd-implied probability is **0% YES**, which looks like an aggressive discount relative to the forecast path.[5]

Historically, August in Hong Kong is a high-heat month, and comparable hot spells have already pushed the city to the year’s hottest readings, including recent coverage of a hottest-day-of-the-year record being broken in July. In practical market terms, that means the consensus should sit around a mid-30s outcome if the heat builds as forecast, while value may lie in the upper-end bands if the New Territories outperforms the urban readings; the contrarian angle is that a thunderstorm or earlier cloud build-up could cap the final maximum below the most bullish range.[4][5]

Traders should watch the Hong Kong Observatory’s hourly readings through the day, because the settlement source is the final “Absolute Daily Max” in the Daily Extract, not an intraday estimate.[1][6] The main catalysts are any forecast updates, thunderstorm timing, and whether the strongest heating lands in the New Territories rather than central urban stations; the latest HKO text forecast already flags isolated showers and squally thunderstorms later, which is the main dependency that could trim the top end if convection arrives early.[1][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on August 7? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.