Highest temperature in Shanghai on May 28?

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Market context

Shanghai's weather on 28 May 2026 will determine which temperature band captures the day's high, with settlement contingent on readings from the Pudong International Airport meteorological station. The 0% crowd probability suggests traders are either uncertain about the specific temperature thresholds offered or expect conditions that fall outside the available ranges entirely.

May in Shanghai typically sits within the late spring transition period, with historical highs ranging between 28–32°C depending on synoptic patterns. The city experiences increasing humidity and occasional convective activity as the pre-monsoon season approaches, though extreme heat events remain uncommon at this time of year. Comparable May datasets from Wunderground show that temperatures exceeding 35°C are rare, whilst readings below 20°C are equally atypical for the season. The absence of any meaningful probability mass across available brackets suggests either that the market's temperature ranges are poorly calibrated relative to seasonal norms, or that traders lack confidence in forecasting precision this far ahead.

Traders monitoring this contract should track seasonal climate indices and any emerging atmospheric patterns in late April 2026, as these will provide the clearest signal for May conditions. The settlement mechanism's reliance on Pudong station data means localised urban heat island effects and specific station microclimate characteristics will matter; historical variance between Shanghai's urban core and airport readings can reach 2–3°C. No major meteorological announcements typically drive May forecasting at this latitude, making this contract primarily sensitive to longer-range ensemble model consensus as the settlement window approaches.

Methodology

This page reviews Highest temperature in Shanghai on May 28? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at Best Prediction Markets — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

Where can I trade this market with the lowest fees?

On Best Prediction Markets, 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?

Best Prediction Markets 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 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.