Highest temperature in Shanghai on August 9?

Platform comparison

Market context

Shanghai’s reading on 9 August will come down to the highest **observed** temperature at Pudong airport, not the broader city forecast or a “feels like” measure. That matters because the market’s 0% YES price sits well below the prevailing forecast consensus: AccuWeather shows an 85°F high with rain and thunderstorms, Time and Date has 84°F/78°F, and WorldWeatherOnline points to about 29°C with heavy rain and strong winds[5][7][13].

Historical August patterns give the contract a clear frame. Long-run guides put Shanghai’s August daytime highs around 31°C to 32°C, with humid conditions and frequent rain, while several 2026 outlooks still cluster around the mid-30s °C before or around 9 August[1][6][11][16]. By contrast, the current market price implies an extremely unlikely upper temperature band, so the gap is not between bullish and bearish weather views so much as between a near-zero market and forecasts that still allow a warm, albeit storm-interrupted, afternoon[1][5][13].

For traders, the key catalysts are the exact daytime rain timing, thunderstorm coverage, and whether a brief pre-frontal warm-up can lift the airport reading before cloud and rainfall suppress the high. Forecasts already agree on high rain chances, but they differ on the ceiling: AccuWeather’s 85°F implies a materially hotter outcome than WorldWeatherOnline’s 27°C forecast, so any updated short-range guidance from the next 24 hours could move the contract more than the broader monthly averages[5][8][13].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on August 9? 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 Best Prediction Markets, 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 Best Prediction Markets. 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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.