Highest temperature in Hong Kong on June 12?

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Market context

On 12 June 2026, the Hong Kong Observatory will record the day's maximum temperature in degrees Celsius to one decimal place. That figure will determine which temperature band resolves YES on this Polymarket contract, currently trading at 0% on Polygon. The settlement window closes at 12:00 UTC on that date, though resolution cannot occur until the Observatory publishes its daily extract data, which typically follows within days of observation.

Hong Kong's June temperatures cluster around 28–32°C, with historical daily maxima rarely exceeding 35°C during early summer. The Observatory's records show that extreme heat events—temperatures above 36°C—occur roughly once per decade in June, typically driven by subtropical high-pressure systems or tropical cyclone peripheries. The current 0% pricing reflects the market's assessment that the most extreme temperature bands carry negligible probability, though this shifts materially during June's latter weeks when heat stress becomes more pronounced. Comparable early-June days from recent years (2015–2024) show maxima clustering between 29–33°C, anchoring baseline expectations.

Traders should monitor the Hong Kong Observatory's seasonal forecasts and any tropical cyclone activity in the Western Pacific, as both influence June temperature trajectories. The Observatory publishes monthly climate summaries and issues heat warnings when temperatures approach 33°C, providing real-time signals of atmospheric conditions. Conditional token mechanics on Polygon mean positions settle directly against the Observatory's published "Absolute Daily Max" figure; no discretionary interpretation applies once data is finalised.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket 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.

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 UK?

Zero. Polymarket UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.