Highest temperature in Shanghai on May 23?

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Market context

Shanghai's weather on 23 May 2026 will be measured at Pudong International Airport, with the highest temperature that day determining which range this market settles into. The current 0% implied probability suggests traders are either waiting for clarity on available temperature brackets or treating this as a placeholder contract pending fuller market participation. On Polygon, USDC holders can mint conditional tokens representing each temperature band, with settlement contingent on Wunderground's historical data for that specific date once it passes.

Late May in Shanghai typically sits within a warm, humid window. Historical records show daily highs in the 28–32°C range during this period, with occasional spikes toward 33–35°C during early heat waves. The 2023 and 2024 May records provide useful anchors: neither year saw extreme outliers at this station, suggesting the market's current zero-probability reading reflects genuine uncertainty about which temperature band will ultimately be offered rather than any expectation of anomalous conditions.

Traders monitoring this contract should track China Meteorological Administration seasonal forecasts, which typically release updated outlooks in early May. Any El Niño or La Niña signals affecting East Asian weather patterns could shift expectations, though May 2026 remains too distant for reliable deterministic forecasting. The settlement window closes at midday UTC on 23 May, meaning traders will have confirmation of the actual high temperature within hours of market closure, reducing post-settlement disputes.

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

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'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.

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, PolyGram triggers a quick verification flow that finishes in minutes.