Highest temperature in Hong Kong on August 19?

Platform comparison

Market context

Hong Kong's daily maximum temperature on 19 August 2026 will be recorded by the Observatory and published in its Daily Extract dataset. The settlement hinges on the official "Absolute Daily Max (deg. C)" figure, reported to one decimal place. This is a straightforward instrumental measurement with no discretionary interpretation—the Observatory's automated weather stations and manual verification processes produce a single definitive value each day.

August is Hong Kong's peak summer season, with historical daily maxima typically ranging between 32–35°C. The 0% crowd probability suggests either extreme confidence in a specific temperature band or insufficient liquidity across the full range of possible outcomes. Reviewing the Observatory's climate records for mid-August over the past two decades provides calibration: most years cluster around 33–34°C, though outliers above 35°C occur roughly once every three to four years during heat waves driven by Pacific high-pressure systems. A trader building a programmatic position would benefit from querying the Observatory's historical daily extracts to establish baseline distributions and identify seasonal volatility patterns.

The key dependency is the publication lag: the Observatory typically finalises daily data within 24–48 hours of the observation date, though formal climate records may take longer to appear in the Daily Extract system. Traders implementing conditional orders or automated settlement monitoring should account for this delay. Real-time weather forecasts from the Observatory and regional meteorological agencies will provide leading indicators in the weeks before 19 August; tropical cyclone activity or unusual atmospheric patterns in early-to-mid August could shift expectations materially. The market cannot resolve until the Observatory publishes the verified figure.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Review UK, which mirrors the Polymarket order book directly.

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 Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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?

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