Highest temperature in Shanghai on July 28?

Platform comparison

Market context

Shanghai's peak temperature on 28 July 2026 will be measured at Pudong International Airport Station and settled against historical records via Wunderground. The market currently shows 0% probability across all temperature bands, reflecting either thin liquidity or a technical pricing anomaly rather than genuine forecasting consensus. On Polymarket, this contract trades as conditional tokens on Polygon using USDC, with settlement tied to a specific meteorological station's daily maximum reading—a data point that becomes verifiable only after the settlement window closes at midday UTC on the resolution date.

July represents Shanghai's peak summer season, when daily highs routinely exceed 35°C. Historical data from Pudong Airport shows that temperatures between 35–38°C occur in roughly 60% of July days, whilst readings above 38°C appear in approximately 25% of cases. The 0% crowd probability suggests either no active traders have positioned yet or the market interface is displaying a display artefact; comparable weather markets on prediction platforms typically show distributed probabilities across multiple temperature bands rather than complete zeroing.

Traders monitoring this contract should track China Meteorological Administration seasonal forecasts and any El Niño or La Niña updates affecting East Asian summer patterns. Shanghai's urban heat island effect and proximity to the East China Sea create localised microclimates that differ from broader regional predictions. Real-time weather model updates from services like ECMWF become most actionable in the week preceding 28 July, when deterministic forecasts sharpen considerably.

Methodology

This page reviews Highest temperature in Shanghai on July 28? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors 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?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi UK. 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.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.