Highest temperature in Hong Kong on August 21?

Platform comparison

Market context

On 21 August 2026, the Hong Kong Observatory will record the day's highest temperature in degrees Celsius, with settlement determined by which range bracket contains that single absolute daily maximum reading. The Observatory publishes these measurements to one decimal place through its Daily Extract climate data portal, which serves as the authoritative source for Hong Kong's official weather records.

Hong Kong's August temperatures cluster predictably within narrow bands. Historical data from the Observatory shows August daily maxima typically range between 31°C and 34°C, with extreme readings above 35°C occurring in roughly one in five years during the month. The 2023 August peak reached 34.6°C; 2022 saw 35.1°C. These patterns reflect the city's subtropical climate during peak summer, when Pacific typhoon activity and thermal conditions create consistent upper-range outcomes. Traders should reference the Observatory's 30-year climate normals, which place August's mean daily maximum at approximately 32.5°C, to calibrate expectations around the likely resolution bracket.

The primary catalyst affecting August 2026 temperatures will be typhoon activity in the Western Pacific. The Observatory issues seasonal forecasts in July that typically indicate whether conditions favour above or below-average temperatures. Sea surface temperatures in the South China Sea, monitored through June and July 2026, will signal whether atmospheric circulation patterns support heat retention or cooling systems. Any tropical cyclone passing within 500 kilometres of Hong Kong in late August could suppress daily maxima by 2–4°C through cloud cover and precipitation, making pre-settlement Observatory advisories critical for traders positioning ahead of the 21 August measurement window.

Methodology

Sports-specific comparison page for Highest temperature in Hong Kong on August 21?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

FAQ

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Can I import form data and lineups?

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