Highest temperature in Shanghai on July 18?

Platform comparison

Market context

Shanghai's highest temperature on 18 July 2026 will be measured at Pudong International Airport Station and resolved via Wunderground's historical weather database. The market currently prices all temperature ranges at 0% on Polymarket, reflecting the contract's recent listing and lack of trading volume; USDC collateral on Polygon has yet to accumulate meaningful positions. Settlement hinges on a single data point—the maximum temperature recorded across all hours on that specific date—making this a straightforward binary outcome once the day passes and Wunderground publishes its archive.

July represents Shanghai's hottest month climatologically, with average highs near 32°C and extremes regularly exceeding 35°C. Historical records from Pudong station show July peaks typically ranging between 33–37°C, though the city has recorded temperatures above 40°C during heat waves. The 0% pricing reflects the market's nascent state rather than any meteorological expectation; traders should anticipate the crowd to distribute probability across multiple temperature bands once liquidity develops and seasonal forecasts sharpen.

The key variable is whether an anomalous heat event occurs in mid-July 2026. China's meteorological authority and regional weather services issue monthly and seasonal outlooks; traders monitoring these forecasts from late June onwards will gain early signals about whether conditions favour above-normal or below-normal temperatures. El Niño or La Niña conditions in the Pacific, typically announced by November of the preceding year, influence East Asian summer patterns and warrant review before committing capital.

Methodology

We track Highest temperature in Shanghai on July 18? 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

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.

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.

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.