Highest temperature in Shanghai on July 31?

Platform comparison

Market context

Polymarket is pricing **0% YES** on a contract that settles to the highest temperature at Shanghai Pudong International Airport Station on 31 July 2026, with outcomes paid in **USDC** via **Polygon** conditional tokens. In practical terms, that means the market is currently treating an outright heat outcome as negligible, even though the settlement source is a single-station daily maximum on Wunderground rather than a citywide average.

That 0% print is best read against Shanghai’s July climate, where average highs are around **32°C** and late-July often sits in the hottest part of the year. Historical context also shows that Shanghai can run far above normal: the city government said Shanghai endured a **12-day heatwave** in 2024 with temperatures at or above **37°C**, and weather references for July commonly show daily highs in the low 30s with occasional spikes into the mid-30s or higher.[2][6][11][19]

For traders, the key catalysts are not policy headlines but the weather setup into the morning and early afternoon UTC settlement window: cloud cover, maritime airflow, rainfall, and the timing of any warm surge over the airport station. Shanghai’s July weather is typically humid and rain-prone, with around a dozen rainy days in the month, so overnight updates, radar trends, and any forecast revision from major weather providers can matter more than broader seasonal averages.[6][15][19] Because the market resolves off the airport station’s recorded maximum, even a brief midday spike can decide the outcome if temperatures rise after the European trading day has already started.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on July 31? 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.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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?

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.