Highest temperature in Hong Kong on June 4?

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Market context

The Hong Kong Observatory will record the highest temperature in Hong Kong on 4 June 2026, measured to one decimal place in Celsius. This date falls in early summer, during Hong Kong's transition into the southwest monsoon season, when daytime highs typically range between 28–32°C depending on cloud cover and wind patterns.

Historical data from the Observatory shows that early June temperatures in Hong Kong rarely exceed 34°C, with the month's absolute maximum typically occurring in the final week rather than the opening days. The 0% crowd probability suggests traders are pricing in an expectation that the highest temperature will fall below the lowest available range option. This reflects the statistical likelihood that early June, whilst warm, remains cooler than the peak summer months of July and August when readings regularly breach 35°C.

Traders should monitor the Hong Kong Observatory's seasonal forecasts released in May 2026, which will indicate whether any unusual heat patterns or blocked weather systems are expected to drive temperatures anomalously high. The settlement depends entirely on the Observatory's published "Daily Extract" data, which typically becomes available within days of the measurement date. Any tropical cyclone activity in the weeks preceding 4 June could suppress temperatures through increased cloud cover and rainfall, whilst a high-pressure system establishing over southern China would favour elevated readings.

Methodology

We track Highest temperature in Hong Kong on June 4? 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 Champions League Prediction, 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.

Is this market available outside the US?

Champions League Prediction is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 Champions League Prediction?

Zero. Champions League Prediction 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.