Lowest temperature in Hong Kong on August 6?

Platform comparison

Market context

Polymarket is pricing this Hong Kong Observatory minimum-temperature contract at **0% YES** today, so the on-chain market on Polygon is effectively saying the lowest reading on 6 August will not land in the YES range once the conditional tokens settle in USDC. That is a notably firm stance for a weather market, but the reference point is a single official daily minimum from the Observatory’s final daily extract, not an intraday swing or forecast headline.

The historical frame argues for caution in reading that price as certainty. Hong Kong’s August climate is usually hot and humid, with the Observatory’s normals for 6 August showing a mean minimum of **26.8°C** and mean temperature of **28.9°C**, while broader August averages are also clustered around the high 20s Celsius. Recent August summaries from the Observatory show minimums often staying elevated even when showers or thunderstorm outbreaks interrupt the day, which makes very low values unusual rather than impossible. [1][6][7][14]

A trader watching this market should focus on the Observatory’s published daily extract and any synoptic setup that might suppress overnight warmth, such as persistent rain, cloud cover, or a cooler air mass. The key dependency is simple: no settlement can occur until the 6 August data are finalised by the Hong Kong Observatory, and the contract resolves from the “Absolute Daily Min (deg. C)” in Celsius to one decimal place. Forecast feeds for Hong Kong currently point to warm conditions with lows still in the upper 20s Celsius, which helps explain why the crowd has pushed the YES side to zero. [14][15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Lowest temperature in Hong Kong on August 6? 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

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%.