Highest temperature in Shanghai on August 19?

Platform comparison

Market context

Shanghai's highest temperature on 19 August 2026 will be measured at Pudong International Airport Station and resolved against Weather Underground's Daily Observations table rather than the summary high-low display. This distinction matters for programmatic resolution: the granular observation log often captures peak readings that summary sections round or omit, creating potential discrepancies that automated systems must account for when building conditional orders or backtesting historical settlement patterns.

August in Shanghai typically peaks between 32–36°C, with occasional spikes above 37°C during heat waves driven by Pacific anticyclones. Historical data from 2015–2023 shows 19 August readings clustering around 33–35°C, though 2013 recorded 38.1°C during an exceptional heatwave. The 0% crowd probability suggests either extreme confidence in a specific temperature band or insufficient liquidity to establish meaningful odds; traders building algorithmic feeds should cross-reference China Meteorological Administration forecasts alongside Wunderground's station data to identify whether the market is mispriced relative to seasonal norms.

Catalysts for August 2026 include tropical cyclone activity in the Western Pacific (typhoon season peaks July–September) and the East Asian summer monsoon pattern. The China Meteorological Administration publishes 10-day outlooks monthly; traders monitoring these alongside real-time station data from mid-August onwards can adjust positions as the settlement window approaches. Wunderground's API documentation specifies timestamp precision for Daily Observations, critical for systems parsing intraday temperature sequences to identify the exact maximum rather than relying on cached summary fields.

Methodology

This page reviews Highest temperature in Shanghai on August 19? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Fees, which mirrors the Polymarket order book at 0% fees.

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 Kalshi Fees. 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.

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.