Highest temperature in Shanghai on July 23?

Platform comparison

Market context

Shanghai’s daytime heat has been running close to seasonal extremes, and the market is now down to whether the Pudong airport station pushes into the very top end of the expected July range. The current crowd price of 0% for **YES** is hard to reconcile with the broader summer pattern: Shanghai’s July average high is around 31°C, but forecasts for July 2026 have pointed to highs in the high 30s Celsius rather than mild conditions.[11][9]

Past heat events show how quickly this market can shift if a hot ridge settles over eastern China. Shanghai has previously logged prolonged spells at or above 35°C, including a 2013 run of ten straight days at 100°F or more, and a 2016 heatwave that triggered the city’s highest-level warning when temperatures reached 40°C at the city station.[1][4] Those episodes matter because the resolution source is the airport station, so a hot inland air mass, light winds and strong afternoon sunshine can be enough to move the daily maximum several degrees above the climatological norm.[4][9]

For traders, the main catalyst is the local forecast through the afternoon peak, especially cloud cover, rainfall, and wind shifts that can cap the high before the settlement window closes at 12:00 UTC. July in Shanghai is usually humid, with substantial rain risk and average highs around 31°C, so convective showers or an early sea-breeze change could suppress the maximum even on a warm morning.[9] If official or station-level forecasts show a ceiling in the mid-30s Celsius, the market remains exposed to a late-day overshoot; if rain develops early, the upper range becomes much harder to reach.[11][9]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

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 Prediction Today. 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.

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.

Do I need to KYC for this market?

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