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 peak reading at Pudong International Airport. The market currently prices all outcome ranges at zero probability on-chain, suggesting either thin liquidity or genuine uncertainty about settlement mechanics rather than confidence in any particular temperature outcome. Traders holding USDC on Polygon can mint conditional tokens across multiple temperature brackets, with the winning range determined by historical data from Wunderground's Shanghai station records.

Late May sits within Shanghai's late spring period, when daily highs typically range between 28–32°C before the onset of summer heat. Historical records show considerable year-to-year variation; the city has recorded highs as low as 22°C and as high as 35°C during this calendar window across different years. The 0% crowd probability likely reflects the market's nascent state rather than any technical barrier to resolution, since Wunderground maintains consistent historical archives and Pudong's automated weather station provides reliable daily maxima.

Traders should monitor seasonal forecasting models released in April and May 2026, particularly any signals of early heat waves or lingering cool air masses from northern systems. The China Meteorological Administration typically issues monthly outlooks that could shift expectations if May 2026 develops significantly warmer or cooler than the 30-year normal. Settlement hinges entirely on Wunderground's recorded figure for that specific station on that specific date, making the resolution source's data integrity the primary dependency rather than any announced event or policy change.

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 Polymarket Legit? — 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 Polymarket Legit?, 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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Legit? 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.