Highest temperature in Hong Kong on June 8?

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Market context

On 8 June 2026, the Hong Kong Observatory will record the day's highest temperature in degrees Celsius. This market resolves to whichever temperature band contains that single daily maximum reading, sourced from the Observatory's official "Daily Extract" climate data. The settlement window closes at midday UTC on that date, though resolution cannot occur until the Observatory publishes its finalised daily record, typically within 24 hours of observation.

Hong Kong's June temperatures are remarkably consistent year-on-year. Historical data from the Observatory shows daily maxima in early June cluster between 29°C and 32°C, with extremes rare. The 0% crowd probability suggests traders expect the actual temperature to fall outside all available resolution bands—a scenario that occurs only when conditions deviate sharply from the 30-year climate norm. June typically marks the onset of the southwest monsoon season, which moderates peak afternoon heat through cloud cover and moisture influx. Comparable June days from 2015–2025 show no instances of temperatures below 27°C or exceeding 35°C, establishing a narrow historical envelope.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any tropical cyclone alerts issued in late May, as these directly influence atmospheric conditions on the settlement date. The Observatory publishes monthly climate summaries and nine-day forecasts; significant deviations flagged in early June forecasting would signal potential movement away from the historical median. Additionally, the German GlüStV and US CFTC frameworks treat weather derivatives as financial instruments subject to regulatory oversight in their respective jurisdictions, though UK-based platforms operating under the Gambling Commission typically allow no-KYC access up to £1,200 (approximately $1,500), permitting retail participation in this market without identity verification below that threshold.

Methodology

We track Highest temperature in Hong Kong on June 8? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket KYC UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does it cost to trade on Polymarket KYC UK?

Zero. Polymarket KYC UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.