Highest temperature in Hong Kong on June 27?

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Market context

The Hong Kong Observatory will publish the absolute daily maximum temperature in degrees Celsius for 27 June 2026, a real-world event that determines the settlement of this prediction market. The crowd-implied probability of 0% for the "YES" outcome suggests traders believe the temperature will fall outside the specific range being wagered on, despite seasonal forecasts indicating above-normal temperatures for Hong Kong this summer[2]. Historical data shows June is typically the warmest month, with the warmest day in recent years occurring on 20 June at an average of 29.7°C, while the hottest day recorded so far this year reached 34.6°C, prompting hail warnings[6][9].

Traders should monitor the Hong Kong Observatory's "Daily Extract" release schedule, as the market cannot resolve until this official data is finalized and published[5]. Recent warnings of extreme heat in the New Territories, where temperatures are expected to hit 37°C, highlight the volatility of local weather conditions that could shift the outcome[5]. While this market is settled in USDC on-chain, the underlying weather volatility mirrors macro uncertainty seen in BTC and ETH funding rates, where sudden shifts in spot prices often correlate with unexpected external catalysts. The dependency on the Observatory's finalized report remains the critical catalyst, with no other announcements likely to influence the temperature reading directly.

Sources: 1 · 2 · 3 · 4 · 5

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

Is this market available outside the US?

BTC 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.

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.

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.