Lowest temperature in Hong Kong on August 6?

Platform comparison

Market context

Hong Kong’s lowest temperature on 6 August will be fixed by the Hong Kong Observatory’s daily extract, using the “Absolute Daily Min (deg. C)” for that date once the record is published. The market settles in the contract’s temperature band, so the key event is not the day’s average conditions but the single coolest reading reported for Hong Kong that day; the observatory’s climatology pages show 6 August normal values around a mean minimum of 26.8°C, which is a useful anchor for how warm early August typically runs.[1][15]

That makes the current 0% implied YES reading unusually conservative unless traders are simply waiting for the data to print. Hong Kong’s August climate is consistently hot and humid, with historical summaries pointing to average lows in the high-20s Celsius and recent Augusts still producing minimums near 27°C to 28°C rather than anything remotely cool.[4][12][16] In practice, a winning lower band would usually need an unusual synoptic setup, such as persistent rain, cloud cover, or a stronger-than-normal marine airmass suppressing the overnight minimum, rather than an ordinary summer pattern.[12][20]

For traders, the watchlist is straightforward: the Observatory publication schedule, any late revisions to the Daily Extract, and whether the day’s minimum is already trending near the lower edge of the likely settlement bucket. Because settlement is in USDC on-chain, the market can reprice quickly once the official figure lands, while the pre-resolution tape is more likely to reflect broad crypto risk conditions than weather fundamentals; on a macro-heavy day, BTC and ETH volatility, funding, and whale flows can still affect liquidity and positioning even though they do not change the underlying temperature outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Lowest temperature in Hong Kong on August 6? 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.

UK Frequently Asked Questions

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Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

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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.

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