**The market-implied 99.1% odds on a 27°C minimum temperature for Hong Kong on September 5, 2026, reflect the Hong Kong Observatory’s official daily minimum observation at its headquarters station.** Post-event confirmation of this exact reading has driven near-unanimous trader consensus, consistent with typical late-summer nocturnal temperatures under partly cloudy to overcast conditions with light winds and high humidity. Historical September minima at the site often cluster around 25–27°C, and no significant model divergence or measurement anomaly appears in available data. The primary resolution risk remains a rare post-publication correction by HKO or an alternative interpretation of “lowest temperature” (for example, a different station or averaging method), though such adjustments are uncommon once daily extracts are released.