Highest temperature in Hong Kong on May 26?

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Market context

The Hong Kong Observatory will record the daily maximum temperature on 26 May 2026, with settlement contingent on finalised data from their official Daily Extract. The market currently shows 0% implied probability across all temperature bands, reflecting the absence of historical data or meaningful price discovery this far ahead. Resolution depends entirely on the Observatory's published "Absolute Daily Max (deg. C)" figure for that date, with settlement on USDC occurring only after data verification is complete.

Hong Kong's May temperatures typically range between 28–32°C, though extremes have occasionally exceeded 34°C during early heat waves or anomalous weather patterns. Historical Observatory records show May maxima cluster around 30–31°C in most years, with outlier events driven by sustained high-pressure systems or tropical influences. The current flat probability distribution suggests traders are awaiting seasonal forecasts or climate pattern indicators before committing capital.

Traders should monitor the Asian summer monsoon onset timing and any El Niño or La Niña signals from meteorological agencies in the months preceding May 2026. The China Meteorological Administration and Japan Meteorological Agency typically issue seasonal outlooks by early 2026 that could shift market expectations. Real-time tracking of sea surface temperatures in the Western Pacific and subtropical ridge positioning will become material catalysts as the date approaches. Early April 2026 will likely see increased activity once weather models gain predictive confidence for late May conditions.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

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

Where can I trade this market with the lowest fees?

On BTC 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.

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on BTC Prediction?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction triggers a quick verification flow that finishes in minutes.