Highest temperature in Shanghai on August 18?

Platform comparison

Market context

Shanghai's maximum temperature on 18 August 2026 will be determined by monsoon patterns and any residual tropical systems affecting the Yangtze River Delta region during mid-summer. The 0% crowd probability suggests traders are either awaiting updated meteorological forecasts or treating this as a placeholder market pending clearer atmospheric conditions data from late July and early August.

August temperatures in Shanghai typically range between 32–36°C, with extreme heat episodes occasionally pushing toward 38–40°C during particularly intense high-pressure systems. Historical August records show the city experiences peak summer heating, though tropical cyclones can occasionally moderate temperatures through cloud cover and precipitation. The resolution mechanism—using Weather Underground's Daily Observations table from Shanghai Pudong International Airport rather than summary figures—creates a technical distinction that matters; intraday temperature spikes recorded at the station may differ from widely reported daily highs.

Traders should monitor tropical cyclone forecasts issued by the China Meteorological Administration and Japan Meteorological Agency from mid-July onwards, as any system tracking toward the East China Sea would substantially alter temperature trajectories. Upper-air ridge positioning over the region in early-to-mid August will be the primary driver of whether temperatures cluster in the typical 33–35°C band or spike into the 37–39°C range. Real-time station data from Pudong becomes actionable only in the final week before settlement, making early positioning dependent on seasonal pattern analysis rather than direct observational evidence.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

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.

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 Prediction Today. 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.

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%.