Highest temperature in Hong Kong on July 3?

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Market context

The Hong Kong Observatory will record the absolute daily maximum temperature in degrees Celsius on 3 July 2026, with data finalised in the official Daily Extract. Current crowd-implied probability sits at 0% for any outcome, yet historical climatology and seasonal forecasts strongly contradict this null stance. July in Hong Kong typically sees daytime highs averaging 31–32°C, with the Observatory’s seasonal outlook for July–September 2026 calling for normal to above-normal temperatures amid the long-term warming trend [2][4]. Recent records reinforce this pattern: the summer solstice of 2024 reached 34°C, and July 2022 peaked at 34.9°C under abundant sunshine [9][10]. The 0% probability appears detached from empirical reality, as trader consensus on adjacent Polymarket events clusters firmly around 31–33°C for early July maxima [1][2].

Traders should monitor the Hong Kong Observatory’s Daily Extract publication schedule, which finalises the “Absolute Daily Max (deg. C)” only after data verification, potentially delaying resolution until midday UTC on 3 July 2026 [1]. Key catalysts include synoptic conditions—particularly the strength of southwesterly flow and cloud cover—which modulate peak temperatures, alongside ENSO status influencing regional warmth [2][4]. While crypto markets currently show no direct macro tie-in to Hong Kong weather, whale flows into BTC/ETH may shift if broader volatility spikes ahead of the settlement window, though weather outcomes remain independent of on-chain mechanics. USDC settlement will execute automatically once the Daily Extract is published, with no manual intervention required. For real-time context, the Observatory’s latest 07:30 HKT readings show 29.2°C at the main site, consistent with early-July norms [7]. Traders must await final data before assessing resolution, as the market cannot settle until the Daily Extract is available [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Hong Kong on July 3? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

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