Highest temperature in Hong Kong on August 16?

Platform comparison

Market context

Hong Kong's highest daily temperature on 16 August 2026 will be recorded by the Hong Kong Observatory and published in their Daily Extract dataset. The settlement window closes at midday UTC on that date, though the actual temperature reading will not be finalised until the Observatory publishes its official daily climate summary, typically within 24–48 hours of the observation period ending. This creates a hard dependency: the market cannot resolve until the Observatory's data becomes available, making it unsuitable for same-day settlement strategies.

August in Hong Kong consistently ranks among the year's hottest months, with historical daily maxima typically ranging between 31–34°C. The 0% crowd probability suggests either extreme confidence in a specific temperature band or insufficient liquidity to establish meaningful odds. Reviewing the Observatory's historical records from prior August 16ths provides the baseline calibration: the 2015 reading was 32.5°C, whilst 2019 recorded 33.1°C. Seasonal patterns show that late-August temperatures occasionally spike above 34°C during typhoon season transitions, though such extremes remain statistically less common than the 32–33°C range.

Traders automating this market should monitor the Observatory's publication schedule and integrate conditional order logic around the settlement date. The Hong Kong Meteorological Society publishes seasonal outlooks that occasionally flag anomalous heat events; the most recent summer 2026 forecast should be cross-referenced against historical volatility. Since the resolution source is deterministic and singular, programmatic approaches should focus on data-ingestion timing rather than probability arbitrage, given the 0% starting position likely reflects genuine uncertainty rather than mispricing.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Polymarket Bot UK. 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%.