Highest temperature in Hong Kong on June 29?

Platform comparison

Market context

The Hong Kong Observatory has confirmed that June 2026 will feature above-normal temperatures with normal to below-normal rainfall, setting the stage for extreme heat on the ground [1]. On Polymarket, this specific contract for the highest temperature on 29 June 2026 is currently priced at 0% YES, implying the crowd believes the temperature will not reach the upper threshold of the betting range, despite the seasonal forecast warning of abnormally high heat for the year [5]. This pricing reflects a cautious on-chain stance where USDC liquidity on the Polygon network is being deployed against conditional tokens that bet on lower ranges, even as the underlying weather data suggests a hot summer [8].

Historical precedents frame this 0% probability as potentially premature, given that Hong Kong recently recorded its hottest day of the year so far at 34.6°C, with the Observatory warning of temperatures hitting 37°C in the New Territories during extreme heat events [3][4]. June typically sees daily highs between 86°F and 91°F, averaging 89°F, which aligns with the forecast for 2026 to be one of the hottest years on record [2][8]. Traders reading the current probability should note that previous summer solstices have matched record highs of 34°C, suggesting that a 0% YES price may underestimate the likelihood of the temperature breaching the upper limit if the above-normal trend persists [9].

The primary catalyst for traders to watch is the finalisation of the "Daily Extract" data from the Hong Kong Observatory, which will publish the "Absolute Daily Max" once the settlement window closes [1]. Until this official data is released, the market cannot resolve, creating a dependency on the Observatory's scheduled updates rather than real-time sensor feeds [1]. Recent news confirms the Observatory has issued warnings for extreme heat on specific days, meaning traders must monitor official announcements for any shifts in the forecast that could push temperatures toward the 37°C threshold seen in the New Territories [3]. The resolution remains strictly tied to the finalized Celsius reading to one decimal place, ensuring the outcome is determined solely by the authoritative climate data [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on June 29? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.