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—whatever it lands at—determines which temperature band this market resolves into. Polymarket currently prices all outcomes at 0%, reflecting the contract's settlement window closing at noon UTC on the resolution date itself, leaving no meaningful trading window once the Observatory publishes its daily extract. The conditional token structure on Polygon means traders holding positions must wait for the Hong Kong Observatory's official data release before USDC settlement occurs.

Hong Kong's August temperatures cluster tightly around historical norms. The Observatory's records show August daily maxima typically range between 31–34°C, with extreme heat occasionally pushing toward 35–36°C during particularly intense heat waves. The 1967 record of 36.3°C remains the August benchmark. Recent years—2015, 2019, and 2023—saw several days exceed 34°C during mid-August, though sustained peaks above 35°C remain uncommon. This historical distribution should anchor expectations about which temperature bands carry genuine probability mass versus those representing tail-risk scenarios.

Traders monitoring this contract should track the Asian summer monsoon patterns and any tropical cyclone activity approaching the South China Sea in early-to-mid August 2026. The Hong Kong Observatory issues forecasts 10 days ahead; watching their extended outlook from early August onwards will signal whether atmospheric conditions favour typical seasonal temperatures or anomalous heat. The Observatory publishes its daily extract typically within 48 hours of the observation date, meaning resolution cannot occur until after 17 August at earliest.

Methodology

We track Highest temperature in Hong Kong on August 16? 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

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

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%.