Highest temperature in Shanghai on August 12?

Platform comparison

Market context

Shanghai's daily maximum temperature on 12 August 2026 will be recorded at Pudong International Airport Station and binned into a temperature range bracket. The resolution hinges on Weather Underground's Daily Observations table rather than its summary display—a distinction that matters when automated feeds or manual transcription introduce discrepancies. For programmatic traders, this specificity demands direct API queries against the primary source rather than reliance on secondary aggregators or screenshot-based verification.

August represents Shanghai's peak summer season, with historical highs regularly exceeding 35°C and occasionally reaching 38–40°C during heat waves. The 0% crowd probability suggests either extreme confidence in a specific temperature band or insufficient liquidity across the full range. Comparable August conditions from 2023–2025 provide calibration: the city experienced sustained heat with daily maxima clustering between 34–37°C, though anomalous years saw spikes to 39°C. Traders should cross-reference China Meteorological Administration datasets and regional weather station archives to establish baseline expectations before the settlement window opens.

Monitoring points include tropical cyclone activity in the Western Pacific during late July and early August—systems tracking toward or away from the Yangtze River Delta materially shift temperature profiles. The China National Weather Service issues seasonal forecasts typically in late June; their August outlook will signal whether meteorologists anticipate above or below-normal heat. Real-time tracking via automated weather APIs feeding into conditional order systems allows traders to adjust positions as the event date approaches and ensemble forecasts converge.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Polymarket Review UK. 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%.