Highest temperature in Shanghai on July 25?

Platform comparison

Market context

Shanghai's summer temperatures in late July typically peak between 32–36°C, with occasional spikes above 37°C during heat waves. The settlement mechanism relies on historical data from Shanghai Pudong International Airport Station, accessed via Wunderground's archive function. A trader evaluating this market programmatically would need to establish a data pipeline that queries Wunderground's daily history pages, parses the maximum temperature field, and maps the result to the correct temperature bracket. The 0% crowd probability suggests either low trading volume or strong consensus that the market's resolution brackets don't align with realistic outcomes—worth verifying against the actual bracket thresholds before committing capital.

Historical July records for Shanghai show that temperatures exceeding 38°C occur roughly once every three to five years during the summer monsoon season. The China Meteorological Administration's 2024 summer report documented sustained heat waves across the Yangtze River Delta region, with Shanghai recording multiple days above 36°C in July. This pattern provides a baseline for calibrating position sizing: if the market's highest bracket sits at 40°C or above, the 0% probability reflects genuine rarity rather than mispricing.

Traders should monitor the Asian summer monsoon forecast and any El Niño or La Niña updates from late June 2026, as these drive regional temperature variance. Wunderground's historical data typically updates within 24 hours of observation, so settlement confirmation should occur by 25 July 12:00 UTC. Conditional order logic could automate bracket selection based on real-time forecasts from the China Meteorological Administration, reducing manual intervention at settlement time.

Methodology

We track Highest temperature in Shanghai on July 25? 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 Polymarket Bot UK. 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.

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 Polymarket Bot 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.