Highest temperature in Hong Kong on May 26?

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Market context

On 26 May 2026, the Hong Kong Observatory will record a daily maximum temperature in Celsius, and Polymarket traders are currently pricing all temperature ranges at 0% probability of occurrence—a technical artefact of how conditional token markets settle before data exists. The Observatory's official "Absolute Daily Max" reading from their Daily Extract dataset will determine which range bracket resolves YES, with settlement finalised once the meteorological authority publishes its verified figures. USDC collateral on Polygon underpins these conditional tokens, meaning traders cannot realise gains until the Hong Kong Observatory releases its data and the market's oracle confirms the outcome.

May temperatures in Hong Kong historically cluster between 28–32°C as the territory transitions into early summer. The 30-year average daily maximum for late May sits around 30.5°C, though individual days frequently exceed 33°C during heat waves or tropical systems. Recent May records show considerable variability: the Observatory's archives indicate ranges from 26°C on cooler days to 35°C during heat events, providing meaningful historical anchors for assessing which temperature brackets carry genuine probability weight versus theoretical extremes.

Traders should monitor the South China Sea monsoon patterns and tropical cyclone forecasts issued by the Hong Kong Observatory in the weeks preceding 26 May. The onset of the southwest monsoon typically influences late-May weather patterns, whilst any tropical systems approaching the region could suppress temperatures or drive them higher depending on timing and intensity. The Observatory publishes seasonal outlooks and monthly forecasts that may shift market expectations as May approaches.

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.

Is this market available outside the US?

Polymarket 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 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket UK triggers a quick verification flow that finishes in minutes.