Highest temperature in Hong Kong on June 23?

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Market context

The real-world event this market tracks is the highest temperature recorded by the Hong Kong Observatory on 23 June 2026, measured in degrees Celsius to one decimal place. In prediction markets, a YES share pays out if the outcome falls within a specific temperature range, while a NO share pays out if it falls outside that range. The current crowd-implied probability of 0% for YES suggests traders believe the temperature will not match the specific range being bet on, though this reflects the market’s view on a narrow outcome rather than the impossibility of heat.

Historical data frames how to interpret this probability. June in Hong Kong is typically hot, with the highest monthly mean maximum temperature reaching 32.4°C in 2016 and 32.3°C in 2015 [5]. Recent early-June days have already hit 33–34°C on clear skies, and the Observatory recorded a peak of 35.6°C on 10 June 2025, matching the June record [8]. Even more striking, a recent heatwave saw temperatures soar to 36.1°C, breaking the 1963 record of 35.5°C [4]. These cases show that temperatures in the 32–36°C range are not unusual, making a 0% YES probability likely a function of the specific range chosen rather than a lack of heat.

Traders should monitor the Hong Kong Observatory’s daily weather updates and the finalisation of the “Daily Extract” data, which is the official resolution source [3]. Short-range models currently converge on a June-typical maximum near 33°C, with 33°C assigned a 56% probability and 32°C at 25% [1]. Cloud cover and humidity levels will be key catalysts; the Observatory has noted 60–85% relative humidity and a probability of significant rain on 23 June, which could suppress peak temperatures [3]. The market cannot resolve until the data is published, so the timing of the official release is a critical dependency.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

What does it cost to trade on Prediction Market UK?

Zero. Prediction Market UK 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.

Do I need to KYC for this market?

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