Highest temperature in Hong Kong on June 23?

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Market context

The real-world event at hand is the peak daily temperature Hong Kong will experience on 23 June 2026, measured by the Hong Kong Observatory in degrees Celsius. While the current crowd-implied probability for a specific outcome sits at 0% YES, this figure likely reflects a lack of consensus on the exact range rather than a belief that heat is impossible. The consensus in broader prediction markets, such as Polymarket, heavily favours 33°C as the frontrunner, assigning it a 56–62% probability, with 32°C as the next most likely outcome at 25% [1]. Historical data frames this value spot clearly: June in Hong Kong has seen monthly mean maximums reach 32.4°C in 2016 and 32.3°C in 2015, while recent extreme heatwaves have pushed daily peaks to 35.6°C in June 2025 and 36.1°C in a record-breaking year [5][7]. The underdog here is not the heat itself, but the specific range below 33°C, which may offer contrarian value if cloud cover increases.

Traders must watch the Hong Kong Observatory’s daily weather bulletins and the timing of the "Daily Extract" publication, as the market cannot resolve until data is finalized [8]. The primary catalyst is the presence or absence of the subtropical ridge; recent early-June observations already reached 33–34°C on clear days, supporting the modest edge for 33°C, yet increasing cloud cover could suppress temperatures [2]. A recent report from the South China Morning Post highlights that Hong Kong recently recorded a maximum of 36.1°C, breaking the 1963 record, which underscores the volatility of the current heatwave season [4]. If the ridge weakens or tropical moisture increases, the value spot could shift toward the 32°C range, making it a strategic play against the heavy 33°C consensus. The settlement window ending 2026-06-23T12:00:00Z ensures traders have until midday to adjust positions based on the final official reading.

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 Who Will Win, 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

Where can I trade this market with the lowest fees?

On Who Will Win, 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?

Who Will Win 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 does it cost to trade on Who Will Win?

Zero. Who Will Win 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.

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.