Highest temperature in Hong Kong on June 17?

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Market context

On 17 June 2026, the Hong Kong Observatory will record the day's highest temperature in degrees Celsius. The market currently prices this event at 0% YES across all temperature bands, reflecting the settlement window's closure at midday UTC on that date—a timing constraint that creates practical friction for traders seeking exposure to Hong Kong's summer heat. Polymarket's conditional token architecture on Polygon means positions settle against whichever temperature range the Observatory publishes in its Daily Extract, with USDC collateral backing each outcome.

Hong Kong's June temperatures historically cluster between 28°C and 34°C, with extreme readings rare but documented. The Observatory's records show that mid-June peaks typically fall in the 31–33°C range, though the 1998 heatwave pushed readings above 35°C during comparable periods. The 0% crowd probability suggests traders view the settlement mechanics—specifically the midday UTC deadline against Hong Kong local time—as prohibitively uncertain rather than dismissing the underlying meteorological possibility.

The Hong Kong Observatory publishes daily climate data with a lag of several days, meaning the "Daily Extract" containing the 17 June reading may not be finalised until late June or early July. Traders should monitor the Observatory's data release schedule and any tropical cyclone warnings issued by the Regional Specialized Meteorological Centre, as these directly influence temperature trajectories. Recent June patterns show increasing volatility; the 2024 monsoon season brought unseasonable cooling to the region, whilst 2023 saw sustained heat. Settlement hinges entirely on official Observatory publication, not real-time sensor data or alternative weather services.

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 Kalshi 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 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.

Is this market available outside the US?

Kalshi 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 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.