Highest temperature in Hong Kong on June 25?

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Market context

The underlying event is the measurement of Hong Kong’s peak heat on 25 June 2026, a date when the city typically faces intense humidity and temperatures near 30°C based on long-term averages[1]. Current crowd-implied probability for the market sits at 0% YES, suggesting traders believe the highest temperature will fall outside the specified range, despite seasonal forecasts predicting above-normal heat for June through August 2026[2]. Historical data shows Hong Kong has recorded extreme highs recently, including 34.6°C earlier this month, the hottest day of the year so far, which challenges the notion that temperatures will remain moderate[7].

Traders should monitor the Hong Kong Observatory’s finalised “Daily Extract” for the Absolute Daily Max, as resolution cannot occur until this official data is published[6]. The key catalyst is the ongoing ENSO status and climate model updates, which the Observatory cites as drivers for the above-normal temperature forecast[2]. Recent news confirms extreme heat warnings have already been issued, with mercury hitting 33.7°C just days ago, indicating the potential for similar or higher peaks on the settlement date[5]. Divergence exists between sportsbook lines, which may underweight extreme heat, and the 0% prediction-market probability, which appears overly cautious given the observed trend of record-breaking temperatures.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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

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.

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.

Do I need to KYC for this market?

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