Highest temperature in Hong Kong on June 23?

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Market context

The underlying event is the Hong Kong Observatory’s measurement of the absolute daily maximum temperature in degrees Celsius on 23 June 2026, which will determine the market’s resolution into a specific temperature range. Current crowd-implied probability of 0% YES suggests traders believe the recorded temperature will fall outside the range being offered, likely due to expectations of above-normal heat. Seasonal forecasts from the Hong Kong Observatory indicate June to August 2026 will be warmer than average, with daily highs in June typically reaching 30°C to 34.6°C, and recent records showing temperatures hitting 37°C in the New Territories during extreme heat warnings[1][5][7]. Historical data shows the warmest day in June often occurs around 20 June, with an average of 29.7°C, but 2026’s outlook points to a top-10 warmest year on record, increasing the likelihood of higher peaks[3][8].

Traders should monitor the Hong Kong Observatory’s updated seasonal and annual outlooks, particularly any revisions to the ENSO status or climate model forecasts that could shift temperature expectations[1][3]. The final resolution depends on the publication of the “Daily Extract” containing the “Absolute Daily Max (deg. C)” for 23 June 2026, which may not be available until after the settlement window closes[1]. Recent news from the Hong Kong Observatory warning of extreme heat in early June, with temperatures reaching 37°C, underscores the volatility and potential for record-breaking highs that could invalidate the current 0% probability[5]. Additionally, regulatory frameworks such as Germany’s GlüStV and the US CFTC’s reach may influence market accessibility, while the “no-KYC up to $1,500” provision allows broader participation without identity verification, enhancing liquidity for this weather-specific prediction[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Hong Kong on June 23? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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

Where can I trade this market with the lowest fees?

On Polymarket KYC UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket KYC 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.

Do I need to KYC for this market?

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