Highest temperature in Shanghai on July 17?

Platform comparison

Market context

Shanghai’s highest temperature on 17 July 2026 will be recorded at the Pudong International Airport Station, with settlement based on Wunderground’s daily maximum in degrees Celsius. The market currently shows a 0% implied probability for the YES outcome, yet Polymarket data reveals a stark divergence: the frontrunner is 38°C at 64%, followed by 39°C at 26%[1]. This contradiction suggests either a misaligned contract definition or a liquidity gap in the specific platform referenced, as cross-platform odds-comparison tools would flag such a 64% versus 0% swing as a critical arbitrage signal.

Historically, mid-July in Shanghai routinely sees peak temperatures between 35°C and 39°C, with 38°C being a common ceiling during recent heatwaves. Comparable cases from 2023 and 2024 confirm that 38°C is not an outlier but a statistically probable outcome for this date, making the 0% YES probability appear inconsistent with regional climatology[1]. Traders should treat the 64% Polymarket line as the more credible consensus, given its alignment with observed weather patterns, while the 0% figure likely reflects a platform-specific error or incomplete market formation.

Key catalysts include the official release of Wunderground’s daily record for ZSPD on 17 July, which will settle the contract at 12:00 UTC. No weather announcements or schedules are expected to alter the outcome before settlement, as the temperature is a direct observational metric. The only dependency is the accuracy of the Wunderground feed, which has historically shown high reliability for Shanghai’s airport station[1]. Traders monitoring cross-platform odds should watch for liquidity corrections that may align the 0% line with the 64% consensus.

Sources: 1 · 2

Methodology

We track Highest temperature in Shanghai on July 17? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Best Prediction Markets. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets 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.