Highest temperature in Shanghai on July 4?

Platform comparison

Market context

On 4 July 2026, the Shanghai Pudong International Airport Station will record its peak daily temperature, a real-world event that determines the outcome of a prediction market where the crowd currently assigns zero per cent probability to any "YES" outcome. Historical data for early July at this location shows daily highs typically climbing from 84°F to 88°F (29°C to 31°C), rarely dipping below 75°F (24°C) or exceeding 95°F (35°C)[1]. While extreme heatwaves have pushed temperatures in other Shanghai districts above 40°C in recent summers, the airport station’s seasonal norms suggest a peak near 32°C to 33°C is far more probable than the current market implies[4][9].

Traders should monitor the latest ensemble forecasts from global models, which currently cluster peak readings near seasonal norms for eastern China, with 32°C as the leading outcome at 36% implied probability and 33°C as the frontrunner at 29%[2]. The primary catalyst is the daily weather schedule for Shanghai, where shortwave solar energy gradually increases through July, rising from 5.1 kWh to 5.6 kWh, potentially driving higher afternoon temperatures[1]. Any divergence between sportsbook lines and prediction-market odds remains stark, as the zero per cent crowd-implied probability contradicts analyst consensus that seasonal averages strongly favour a high above 30°C, creating a significant cross-platform odds-comparison opportunity for informed participants[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on July 4? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 PolyGram. 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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.