Highest temperature in Shanghai on August 11?

Platform comparison

Market context

Shanghai's weather on 11 August 2026 will depend heavily on the monsoon patterns and any tropical systems active in the western Pacific during that period. Mid-August typically sits within Shanghai's summer peak, when daily highs routinely exceed 32°C, though the exact temperature range depends on whether high-pressure systems dominate or moisture-laden air masses bring cloud cover and precipitation. The 0% crowd probability suggests traders are either uncertain about the specific temperature bracket or awaiting clearer seasonal forecasts as the date approaches.

Historical August records for Shanghai show considerable year-to-year variation. The city's highest August temperatures have reached 40°C on rare occasions, whilst cooler August days with highs around 28–30°C occur when typhoons or frontal systems push through. Comparable years with similar atmospheric conditions—particularly those influenced by El Niño or La Niña patterns—provide useful reference points for assessing the likelihood of extreme heat versus more moderate conditions. The settlement window's reliance on Weather Underground's Daily Observations table at Shanghai Pudong International Airport means the resolution will reflect actual station data rather than city-wide estimates.

Traders should monitor tropical cyclone forecasts from late July onwards, as any system tracking towards eastern China would substantially cool temperatures and increase cloud cover. The China Meteorological Administration typically issues extended outlooks by early August. Additionally, upper-atmosphere pressure patterns and sea-surface temperatures in the East China Sea will shape whether high-pressure ridging drives sustained heat or whether monsoon troughs allow cooler air masses to penetrate the region.

Methodology

We track Highest temperature in Shanghai on August 11? 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.

UK Frequently Asked Questions

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.

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%.