Highest temperature in Hong Kong on May 23?

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Market context

On 23 May 2026, the Hong Kong Observatory will record the day's highest temperature in Celsius. Polymarket currently prices this contract at 0% YES, meaning traders are pricing in no meaningful probability that any given temperature range will resolve as the day's peak. The settlement window closes at 12:00 UTC on that date, though actual resolution depends on the Observatory finalising its daily extract data, which typically occurs within days of observation. Traders holding conditional tokens on Polygon will need to wait for that official publication before any payout occurs.

Hong Kong's May temperatures typically range between 28–33°C, with occasional peaks above 34°C during heat waves. Historical data from the Observatory shows that extreme heat events—temperatures exceeding 35°C in May—occur roughly once every three to five years, driven by pre-monsoon ridge systems pushing warm air northward from the South China Sea. The current 0% pricing reflects either extremely tight confidence in a narrow range or minimal market participation; comparable single-day weather contracts on Polymarket often show non-zero probabilities across multiple temperature bands, suggesting this market may be thinly traded or recently listed.

The key catalyst is the arrival of any significant weather system in late May 2026. The Hong Kong Observatory issues heat warnings when temperatures are forecast to reach 33°C or above, and such advisories typically emerge three to five days before the event. Traders should monitor the Observatory's ten-day forecast from mid-May onwards, as well as regional atmospheric pressure patterns tracked by the China Meteorological Administration, which often precedes Hong Kong's conditions by 24–48 hours.

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 PolyGram, 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

Is this market available outside the US?

PolyGram 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 PolyGram?

Zero. PolyGram 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, PolyGram 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.