Highest temperature in Hong Kong on June 23?

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Market context

The real-world event driving this market is the Hong Kong Observatory’s measurement of the absolute daily maximum temperature in degrees Celsius on 23 June 2026, which will determine the resolution range. Current crowd-implied probability of 0% for a specific outcome appears inconsistent with short-range models converging on a June-typical maximum near 32–33°C, where traders assign 56% probability to 33°C and 25% to 32°C[1]. Historical parallels include Hong Kong’s record-setting day earlier this year, when temperatures hit 32°C, marking the hottest day of 2026 so far[10], while seasonal forecasts for June–August 2026 predict above-normal temperatures across the region[3]. These comparable cases suggest the 0% probability may reflect a misunderstanding of the market’s structure rather than genuine climatic impossibility.

Traders should monitor the Hong Kong Observatory’s upcoming “Daily Extract” publication, which finalises the absolute daily max data, and watch for extreme heat warnings similar to recent alerts for the New Territories, where temperatures reached 37°C[8]. The tropical cyclone season, likely starting in June or later, could also influence temperature patterns[9]. A recent report from The Standard confirms Hong Kong’s 32°C peak as the year’s highest, reinforcing the plausibility of similar June values[10]. Regulatory accessibility hinges on German GlüStV provisions, US CFTC reach, and the “no-KYC up to $1,500” threshold, which allows immediate participation without identity verification for this specific market, enhancing liquidity for retail traders under these jurisdictions.

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 Polymarket Legal 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

Is this market available outside the US?

Polymarket Legal UK 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'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 Polymarket Legal UK?

Zero. Polymarket Legal UK 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, Polymarket Legal UK triggers a quick verification flow that finishes in minutes.