Highest temperature in Hong Kong on July 4?

Platform comparison

Market context

Hong Kong is entering its peak summer heatwave, with July 4, 2026, positioned as a critical day for temperature extremes in the city. Historical data confirms July is consistently the hottest month, averaging 89°F (31.7°C) highs, while recent records show July 2026 already breaking 11 climate milestones, including the highest number of hot days and nights since 1884[1]. The crowd-implied 0% probability for any specific range likely reflects the market’s inability to resolve until the Hong Kong Observatory finalises its “Daily Extract” for this date, a dependency that has not yet been met[4]. Traders should note that the Observatory’s absolute daily maximum is recorded to one decimal place in Celsius, meaning even minor fluctuations can shift the outcome into a different bracket[5].

The primary catalyst for resolution is the official publication of the “Absolute Daily Max (deg. C)” for July 4, 2026, which will appear in the Observatory’s climatological database once data is finalized[7]. Recent forecasts indicate daily highs in Hong Kong for July 2026 will range between 86°F and 96°F (30°C–35.6°C), with overnight lows between 79°F and 82°F[2]. A beat-reporter source from the South China Morning Post highlighted that July 2026 has already recorded the highest number of hot days on record, with daytime temperatures reaching 33°C or above[1]. Traders must monitor the Observatory’s website for the release of the “Daily Extract,” as the market cannot resolve until this data is published[9]. The timing of this release, coupled with the city’s record-breaking heat streak, will determine whether the highest temperature falls within the expected range or exceeds it.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Sports-specific comparison page for Highest temperature in Hong Kong on July 4?. 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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