Highest temperature in Shanghai on July 11?

Platform comparison

Market context

Shanghai faces a wet, gusty Saturday with light rain and cloud cover expected at Pudong International Airport, pushing the likelihood of a record-breaking high temperature to near zero. The market currently prices the YES outcome at 0%, reflecting the immediate on-chain consensus that today’s weather conditions will not produce extreme heat.

Historical July data for Pudong shows average highs climbing from 84°F to 88°F (29°C–31°C), with peak sunny days reaching 35°C (95°F) [1][2]. However, the current forecast for 11 July 2026 predicts a maximum of only 30°C, with rain and gusty winds dominating the day [8][10]. This aligns with the 0% probability, as comparable wet July days in Shanghai have rarely exceeded 32°C, making a high-temperature outlier highly improbable under these conditions.

Traders should monitor real-time updates from Wunderground, the official resolution source, for any sudden shifts in temperature readings before the 12:00 UTC settlement window [1]. Key catalysts include the timing of the afternoon rain and wind intensity, which directly suppress heat accumulation. With USDC liquidity locked on Polygon via conditional tokens, the market’s pricing will adjust only if Wunderground records an unexpected spike above the 30°C threshold, though current meteorological schedules suggest no such anomaly is forecast.

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

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 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.