Highest temperature in Shanghai on August 10?

Platform comparison

Market context

Polymarket prices this Shanghai heat contract at **0% YES** today, which leaves the market effectively assuming the station at Shanghai Pudong International Airport will not record a top temperature that lands in the YES range before the 12:00 UTC settlement cut-off. On Polymarket, traders are exchanging USDC on Polygon through conditional tokens, so the live price reflects where participants think the daily maximum will settle, not just whether Shanghai feels hot in general.

The historical read-through is straightforward: Shanghai is normally in its hottest stretch in August, with average highs often around the low 30s Celsius and occasional spikes well above that in past summers. Forecast vendors currently show a wet, windy setup rather than a clean heatwave, with several projecting around 27–28°C for 10 August and heavy rain or storm bands, which would tend to cap the airport’s top reading if verified at the observing site.[1][2][4][7] The 0% price therefore implies the crowd is treating this as a low-probability upside temperature surprise rather than a standard late-summer outcome.

A trader should watch the station-specific evolution, not city-wide weather headlines: the market resolves from Weather Underground’s Daily Observations for Shanghai Pudong International Airport Station, which makes timing and local microclimate more important than broad forecast summaries.[14] The main catalysts are any shift in the tropical-storm track, changes in rain intensity around the airport, and whether brief clear spells allow a hotter midday reading before the settlement window closes. If the forecast firms up towards a drier, sunnier afternoon, the contract can reprice quickly; if the stormier models hold, the zero line is likely to remain anchored.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on August 10? 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

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 PolyGram. 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.

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.