Highest temperature in Hong Kong on May 27?

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Market context

On 27 May 2026, the Hong Kong Observatory will record the day's maximum temperature in degrees Celsius. Polymarket currently prices this contract at 0% across all temperature bands, reflecting the standard state of markets for weather events months in advance where conditional tokens trade at minimal liquidity until the settlement window approaches. The Hong Kong Observatory's official "Absolute Daily Max" measurement—published in their Daily Extract once finalised—will determine which temperature range resolves YES, with USDC settlement on Polygon following resolution.

Hong Kong's May temperatures typically range between 28–32°C, though extremes have occurred. Historical data shows May maxima have reached 34°C in anomalously hot years, whilst cooler May days have bottomed near 26°C. The 0% pricing reflects not scepticism about any particular temperature occurring, but rather the standard discount applied to unresolved future weather contracts where no meaningful price discovery has yet occurred. As May 2026 approaches, traders will watch seasonal forecasts and any emerging climate patterns; currently, no near-term catalyst exists to shift probabilities.

The settlement window closes at 12:00 UTC on 27 May, after which the Observatory's data becomes final. Traders should monitor the Hong Kong Observatory's website directly for historical May patterns and watch for any unusual weather announcements in spring 2026. The contract cannot resolve until official data is published and verified, meaning early May forecasts will likely drive the first material price movements in these conditional tokens.

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

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 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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.