Highest temperature in Hong Kong on August 16?

Platform comparison

Market context

On 16 August 2026, the Hong Kong Observatory will record the day's maximum temperature in degrees Celsius to one decimal place. That reading will determine which temperature band resolves YES on this Polymarket contract. Currently, the market is pricing all outcome ranges at 0% probability on the Polygon-based USDC settlement layer, reflecting either a technical lag in crowd pricing or genuine uncertainty about which specific band will contain the day's high.

Hong Kong's August temperatures show consistent patterns worth examining. The Observatory's historical daily maxima for mid-August typically cluster between 31°C and 34°C, with occasional spikes above 35°C during heat waves. The 1990–2020 climatological mean for 16 August sits near 32.5°C. Extreme readings above 36°C occur in roughly one year per decade during this period, whilst readings below 30°C are exceptionally rare. The crowd's current 0% pricing across all bands suggests either conditional token liquidity constraints or that traders are awaiting more granular range definitions before committing capital.

Traders monitoring this contract should track the Hong Kong Observatory's seasonal forecasts and any tropical cyclone activity in the Western Pacific during early-to-mid August 2026, as storm systems can suppress temperatures significantly. The Observatory publishes extended outlooks roughly two weeks ahead; that guidance typically becomes the first concrete signal for temperature expectations. Settlement depends entirely on the Observatory's published "Daily Extract" data becoming available after 16 August; delays in that publication could postpone resolution beyond the 12:00 UTC window.

Methodology

This page reviews Highest temperature in Hong Kong on August 16? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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%.