Highest temperature in Shanghai on August 1?

Platform comparison

Market context

Shanghai’s daytime maximum at Pudong airport is usually well into the 30s in early August, and the market resolves on the single highest reading posted by Wunderground for the station on 1 August. For a programmatic trader, the key is not the daily average but the day’s peak observation, so automated monitoring should poll the history page and map the observed maximum into the market’s temperature bands rather than infer from forecast means.

The historical frame is straightforward: Shanghai is at or near its annual heat peak in August, with average highs around 31–32°C and documented extremes reaching 40°C to 41°C in past heatwaves.[1][8] Shanghai’s own city guidance says the hottest temperatures typically arrive in July and August and can exceed 35°C, which makes low-temperature outcomes less likely than warm or very hot bands in a normal year.[15] That is consistent with a market that can stay mispriced if participants anchor on seasonal averages instead of tail-risk heat events.

For a trader running conditional orders or copy strategies, the main catalysts are the actual afternoon temperature trace, local heatwave alerts, cloud cover, rain bands, and any typhoon-related cooling or wind shifts that move the airport station off the day’s thermal peak. Shanghai has periodically issued red heat alerts during severe episodes, and past records show that a single hot day can dominate the monthly distribution.[6][11] The practical workflow is to watch the station’s live/historical update cycle, compare the current peak against the relevant range brackets, and only adjust once the day’s maximum becomes operationally sticky rather than reacting to an early-morning print.

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

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'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.

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.