Highest temperature in Hong Kong on June 14?

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Market context

On 14 June 2026, the Hong Kong Observatory will record the day's peak temperature in Celsius to one decimal place. That reading determines which range this contract settles into. Currently, Polymarket prices all outcome brackets at effectively zero probability across the board, reflecting minimal trading activity and no consensus on where the thermometer will land. The settlement hinges entirely on official data published by the Observatory's Daily Extract once the date passes and measurements are finalised.

Hong Kong's June climate sits at the threshold of the summer monsoon season. Historical data shows daily maxima in mid-June typically cluster between 28–32°C, though heat waves can push readings above 34°C and cooler systems occasionally suppress them below 27°C. The 0% crowd probability suggests traders have simply not engaged with this contract yet rather than expressing genuine certainty about temperature ranges. Comparable June days from the past decade provide the most reliable anchor: the Observatory's records show considerable year-to-year variation, making any single outcome genuinely uncertain.

The key variable traders should monitor is the large-scale atmospheric pattern developing across East Asia in early June 2026. Tropical cyclone activity, the position of the Pacific subtropical high-pressure system, and any northward surge of the southwest monsoon will all influence whether the 14th breaks seasonal norms. The Observatory publishes extended forecasts roughly ten days ahead; watching those updates and any official heat warnings issued by Hong Kong's weather authorities will signal whether extreme ranges become plausible. Settlement cannot occur until the Observatory publishes its Daily Extract data, typically within days of the observation date.

Methodology

We track Highest temperature in Hong Kong on June 14? 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

Where can I trade this market with the lowest fees?

On Kalshi 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 Kalshi UK?

Zero. Kalshi 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, Kalshi 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.