Highest temperature in Hong Kong on June 23?

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Market context

The underlying event is the highest temperature recorded by the Hong Kong Observatory on 23 June 2026, measured in degrees Celsius to one decimal place. Current crowd-implied probability sits at 0% for the YES outcome, suggesting the market expects the temperature to fall outside the specific range being traded, despite seasonal forecasts indicating above-normal heat for June-August 2026[2]. Historical data shows daytime maximums in Hong Kong during June typically average 30°C, with high heat and humidity being standard[1]. Recent extremes support this trend, as Hong Kong recorded its hottest day of the year so far at 34.6°C on a Friday in June, with the Observatory warning of temperatures hitting 37°C in the New Territories during extreme heat spells[6][7]. The warmest day historically in June often occurs around 20 June, averaging 29.7°C, yet the current forecast points to sustained above-normal temperatures that could push daily highs significantly higher[9].

Traders should monitor the Hong Kong Observatory’s upcoming "Daily Extract" publications, which finalise the "Absolute Daily Max" data required for market resolution[4]. The resolution cannot occur until this official data is published, creating a dependency on the Observatory’s schedule rather than real-time sensor feeds. Analysts note that the tropical cyclone season is likely to start in June or later, which could introduce sudden rainfall and temperature drops, though the current seasonal outlook predicts normal to below-normal rainfall[2][4]. Recent news from the South China Morning Post highlights the volatility of June temperatures, with hail warnings issued alongside record highs, suggesting that weather patterns remain unpredictable despite the above-normal temperature forecast[7]. The divergence between sportsbook lines (which may not cover this specific weather contract) and the 0% prediction-market probability indicates a strong consensus that the target range is unlikely to be hit, potentially due to the specific threshold being set too high or too low for the expected 30–37°C range.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Best Prediction Markets 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?

Best Prediction Markets 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.

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 Best Prediction Markets UK?

Zero. Best Prediction Markets 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.