Highest temperature in Shanghai on August 3?

Platform comparison

Market context

Polymarket has this contract pricing **0% YES** right now, which implies the market is treating an August heat extreme at Shanghai Pudong International Airport as effectively not expected. The settlement still depends on the *highest* temperature recorded at the airport station by 12:00 UTC on 3 August, and the contract resolves against Wunderground’s daily history for that specific site, with winnings paid in USDC via conditional tokens on Polygon.

The historical frame is straightforward: Shanghai in August is normally hot, but the day-to-day range is usually well below the sort of outsized spike that would push a temperature bucket far beyond the norm. Forecast products for early August 2026 point to highs around the low-to-mid 30s Celsius for Shanghai, with some sources showing 3 August near 34–35°C and others giving citywide maxima around 37°C, which is still within a summer heat pattern rather than an exceptional outlier.[2][4][5][10][12] That matters because prediction markets often stay pinned near zero when a contract requires a very specific station reading and the consensus forecast does not point to a clear threshold-breaking event.

For traders, the main catalysts are the latest airport-area forecast updates, any thunderstorm or typhoon-related shifts, and the timing of the day’s warmest hour before the settlement window closes. Shanghai is in peak monsoon/typhoon season in August, so cloud cover, rain bands and wind changes can materially cap the high, even if the broader city forecast looks hot.[4][14] A Polymarket user watching this market would typically monitor short-range updates from the resolution source and nearby official forecasts, because a small change in cloud cover or storm track can move the highest observed temperature enough to alter which outcome bucket wins.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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