Highest temperature in Hong Kong on August 19?

Platform comparison

Market context

Hong Kong's peak temperature on 19 August 2026 will be measured by the Observatory's official daily maximum reading, reported to one decimal place. August typically ranks among the year's hottest months in Hong Kong, with historical daily maxima frequently exceeding 32°C during the summer monsoon season. The current 0% crowd probability suggests traders are either awaiting clearer seasonal forecasts or treating this as a placeholder market ahead of the settlement window.

Historical August data from the Hong Kong Observatory shows considerable year-to-year variation. Between 2015 and 2024, daily maximum temperatures on mid-August dates ranged from approximately 29°C to 35°C, with most readings clustering between 31–34°C. The 2023 summer was notably intense, with multiple days exceeding 34°C during this period. Such historical ranges provide the baseline against which August 2026 conditions should be evaluated once seasonal models become more refined.

Traders monitoring this market should track the Asian summer monsoon forecast updates, typically issued by meteorological services in June and July 2026. The El Niño/La Niña status heading into northern hemisphere summer will influence regional temperature patterns. Real-time factors closer to mid-August—including tropical cyclone activity in the western Pacific and upper-atmosphere circulation patterns—will narrow uncertainty considerably. The Hong Observatory publishes extended forecasts on its website; these become increasingly reliable within two weeks of the target date.

Methodology

We track Highest temperature in Hong Kong on August 19? 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Prediction Today. 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%.