Highest temperature in Shanghai on July 24?

Platform comparison

Market context

Shanghai’s high temperature on 24 July will be set by the day’s maximum at Shanghai Pudong International Airport, so the practical question is whether the airport reaches the low- to mid-30s Celsius seen in typical late-July heat. Forecasts for Shanghai in this window point to hot conditions, with daytime highs around 32–35°C and a meaningful chance of showers or thunderstorms, which matters because cloud cover and rain can cap the peak temperature if they arrive early enough.[2][4][5]

A 0% crowd-implied YES probability is best read as a signal that the market is either mispriced or illiquid, not that the outcome is impossible. Shanghai’s July climate is usually hot and humid, with late-month averages around the low 30s Celsius and frequent rainfall, so a single-day airport high inside a defined temperature band is often decided by a narrow margin rather than a dramatic swing.[2][4] For a programmatic approach, traders would typically map the latest airport forecast to the market’s bands, then update as new model runs and observed morning temperatures come in.

The main catalysts are timing, convection, and the airport’s own local weather. The strongest move usually comes from whether morning sun persists into early afternoon or whether scattered showers and thunderstorms develop, as one forecast already points to sun giving way to afternoon showers with a peak near 95°F and another to a warm, wet day with 40–50% rain chances.[1][5] In a rules-based workflow, the useful dependencies are the hourly forecast, radar, and any shift in precipitation timing before the settlement window closes, because the published result is the station’s daily maximum rather than a citywide average.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

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 Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.