Highest temperature in Shanghai on August 1?

Platform comparison

Market context

Shanghai Pudong International Airport’s hottest reading on 1 August will decide the contract, and the current 0% YES pricing leaves the market implying the upper temperature range is not expected to be reached. That sits well below the broader August climate picture for Shanghai, where typical highs are around 31–33°C and early-August daily averages are usually in the high 20s Celsius, with humidity and rainfall both high enough to limit extremes but not to rule them out entirely.[1][5][11]

Historically, Shanghai can still produce very hot early-August outcomes. Travel-focused climate summaries put 1 August average highs near 30.7°C, while wider August normals point to highs of roughly 32°C; more importantly, the city has a record of intense heat events, including a reported all-time high of 41°C and periods when temperatures held at 100°F or more during a multi-day heat wave.[1][10][16] That means the market’s zero-implied probability looks materially more cautious than the long-run weather backdrop, although an airport station reading will often run a touch lower than inner-city maxima because of siting and exposure.[1][10]

For traders, the main catalysts are the local synoptic pattern and any heat-wave or typhoon-related forecast updates for the Yangtze River Delta, rather than scheduled announcements. Reuters has previously noted that Shanghai and neighbouring cities can remain under prolonged high-temperature alerts when broader eastern China heat builds, while August forecasts for Shanghai typically show highs spanning the low 30s Celsius with heavy humidity and intermittent rain.[4][9] The key cross-platform comparison is therefore between this contract’s 0% YES line, the much higher climatological expectation for an August peak in the low-to-mid 30s Celsius, and any sportsbook or forecast-market pricing that tracks near-term weather models rather than the calendar average.[1][4][5]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on August 1? 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets 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.