Highest temperature in Shanghai on July 12?

Platform comparison

Market context

Shanghai is currently experiencing light rain and strong easterly winds on Sunday 12 July, with the high temperature capped at 30°C at the Hongqiao station, while the Pudong airport site faces similar overcast conditions. The market for the highest temperature at Pudong on this date shows a 0% implied probability for the YES outcome, suggesting the crowd believes the peak will fall outside the specific range being traded, despite historical July averages hovering around 31°C[1].

Historical data frames this as a classic underdog scenario where the consensus has overcorrected against the heat. While typical July highs exceed 30°C and often reach 35°C during sunny spells, the 2026 post-plum-rain transition introduces significant variability that keeps the peak within a narrow 29–31°C cluster[1][6]. The current frontrunner in the broader market is 30°C at 38%, followed by 29°C at 32%, indicating that small shifts in cloud cover or wind timing alter the peak by just 1–2°C, making the 0% YES probability a potential value spot for contrarians betting on a surprise heat spike[1].

Traders must watch the timing of any remaining rain and the shift in wind direction, as the current overcast sky and 89% humidity are suppressing temperatures significantly below the seasonal norm[4]. The resolution depends entirely on the Wunderground record for Pudong, where the maximum temperature on 9 July was 31°C and 32°C on 10 July, suggesting the system retains heat potential if the rain clears before midday[3]. With settlement ending at 12:00 UTC, the next 48 hours of model updates will be critical to refining whether the consensus of 30°C holds or if the 0% line offers a mispriced entry[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Who Will Win. 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.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.