Highest temperature in Shanghai on August 2?

Platform comparison

Market context

Shanghai’s peak temperature at Pudong airport on 2 August will be judged against a city that is usually hot, humid and prone to spikes above 35°C in August, but not every day reaches the extremes needed to clear the upper bands in this contract. Shanghai’s August average high is around 32–33°C, with typical daily highs often in the high 20s to mid-30s Celsius, and recent seasonal guides put the month’s highs near 32°C to 33°C and lows around 25°C to 26°C.[1][4][8][17] That makes the current crowd-implied probability of 0% YES stand out sharply against climatology: the market is effectively pricing an outcome below the usual August heat profile, even though Shanghai has recorded major late-summer heat surges, including an August record of 39.5°C in 2025 and a citywide all-time extreme of 41°C in 2013.[2][3][5]

For traders, the key catalyst is the actual airport observation stream rather than city-centre headlines, because the contract settles on the highest temperature recorded at Shanghai Pudong International Airport Station by the end of the settlement window.[Market description] That means cloud cover, sea-breeze timing, and precipitation near Pudong matter more than broad Shanghai averages, and the contract can diverge from any analyst view built on downtown forecasts or daily city highs. The latest August 2026 outlooks available in market-facing weather guides point to highs roughly in the low 30s Celsius, with some forecasts clustering around 32°C to 33°C for the month and individual days in the 29°C to 34°C range.[9][10][15][17] On a cross-platform basis, this suggests sportsbook-style weather lines, if available, would likely sit well above zero, while the prediction market’s 0% implies an unusually strong bearish stance that only makes sense if participants expect the airport to stay below the higher settlement bands.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on August 2? 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

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.

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.

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.