Highest temperature in Hong Kong on June 23?

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Market context

The real-world event is the daily maximum temperature recorded by the Hong Kong Observatory on 23 June 2026, specifically the "Absolute Daily Max" in degrees Celsius. This single data point will determine which temperature range bracket resolves as the winner, with the settlement window closing at 12:00 UTC once the official "Daily Extract" is finalized.

Historical June data frames the current 0% YES probability as a clear mispricing, given that early-June observations have already reached 33–34°C on clear days, supporting a modest edge for 33°C while 31°C and 32°C remain competitive[5][6]. The Observatory recorded a maximum of 36.1°C on 10 June 2025, levelling the record for the month, and June 2016 holds the highest monthly mean maximum at 32.4°C, indicating that temperatures in this range are routine rather than exceptional[3][4]. A programmatically evaluating trader would note that the market frontrunner is 32°C at 73%, with 33°C at 56%, suggesting the crowd is underestimating the likelihood of higher extremes compared to the 0% implied probability[1].

Traders must monitor the Hong Kong Observatory’s daily forecast updates and any extreme heat warnings, as urban areas can reach 35°C while outlying regions hit 36–37°C during heatwaves[7]. The primary catalyst is the publication of the official "Daily Extract" for 23 June, which is the sole resolution source and cannot be accessed until the data is finalized[2]. Recent news from the South China Morning Post confirms the Observatory has warned of extreme heat with temperatures soaring past 34°C, reinforcing the need to track live weather schedules and dependency on the finalised dataset for accurate conditional order execution[3][10].

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 Review 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

Where can I trade this market with the lowest fees?

On Polymarket Review 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.

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 Review UK?

Zero. Polymarket Review 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 Review UK triggers a quick verification flow that finishes in 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.