Highest temperature in Hong Kong on June 23?

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Market context

The real-world event driving this market is the peak daytime heat recorded by the Hong Kong Observatory on 23 June 2026, specifically the absolute daily maximum temperature in degrees Celsius. With the current crowd-implied probability for a high-temperature outcome sitting at 0%, the market reflects a near-certainty that extreme heat will not materialise, likely due to the immediate shift toward severe wet weather.

Historical data frames this low probability against recent record-breaking heatwaves, such as the 36.1°C peak recorded on 10 June 2025 and the 36.9°C spike in Sheung Shui during the hottest Mangzhong on record. However, the Hong Kong Observatory has warned that this intense heat is rapidly giving way to a nine-day stretch of rain, with temperatures expected to drop to a cooler 26–30°C range by Sunday and Monday[1]. This sharp transition from scorching highs to squally thunderstorms explains why the market currently dismisses high-temperature scenarios, as the active weather system is poised to suppress peak readings significantly.

A power-user evaluating this market programmatically would monitor the HKO’s Daily Extract for the finalised Absolute Daily Max value, while tracking the low-pressure trough lingering over southern China that drives the prolonged wet period[1]. The primary catalyst is the scheduled arrival of heavy showers peaking on Sunday and Monday, which will directly cap the temperature ceiling for the settlement date. Traders should also watch for any sudden deviations in the forecasted nine-day rain pattern, as the HKO explicitly notes that relief from scorching temperatures will arrive via this prolonged wet weather[1]. The settlement depends entirely on the official publication of data, meaning no resolution occurs until the relevant Daily Extract is finalized.

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

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

Is this market available outside the US?

Polymarket Bot 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.

What does it cost to trade on Polymarket Bot UK?

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