Highest temperature in Shanghai on August 12?

Platform comparison

Market context

Shanghai's peak temperature on 12 August 2026 will be measured from the official Pudong International Airport weather station, with resolution determined by the Daily Observations table on Weather Underground rather than summary figures. The 0% implied probability suggests the market crowd expects no meaningful chance of the outcome resolving to a specific temperature range, though the settlement window closes at midday UTC, capturing only morning and early afternoon readings.

August temperatures in Shanghai historically cluster between 32–36°C, with extremes occasionally reaching 37–38°C during heat waves. The city's subtropical climate produces consistent summer highs, making mid-range outcomes (33–35°C) statistically dominant. The 0% probability reflects either extreme confidence in a particular range or insufficient liquidity driving prices to the floor; comparable weather markets on this platform typically show non-zero probabilities across multiple temperature bands for August dates in major cities, suggesting this reading warrants scrutiny rather than acceptance at face value.

Traders should monitor China Meteorological Administration forecasts released in early August 2026, which typically provide 10-day outlooks identifying heat wave conditions or anomalous patterns. The East Asian summer monsoon's positioning in mid-August influences Shanghai's weather significantly; a stronger monsoon presence typically moderates temperatures, whilst ridge patterns favour higher readings. Recent years have seen August heat waves in eastern China tracked extensively by state media, providing early signals of exceptional conditions that might shift consensus away from the consensus range.

Methodology

We track Highest temperature in Shanghai on August 12? 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

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.

UK Frequently Asked Questions

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 Who Will Win. 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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.