Highest temperature in Shanghai on August 18?

Platform comparison

Market context

Shanghai's highest temperature on 18 August 2026 will be measured at Pudong International Airport Station and recorded in Weather Underground's Daily Observations table, with settlement determined by that primary source rather than any summary figures. The market currently prices this outcome at 0% across all temperature bands, reflecting the distance between now and the August settlement window and the inherent difficulty in forecasting specific daily maxima nearly two years forward.

Historical August temperatures in Shanghai show a consistent pattern: daily highs typically range between 32–35°C during mid-August, with occasional peaks above 36°C during heat waves. The city's subtropical climate produces reliably warm conditions in summer, though the exact daily maximum depends on cloud cover, precipitation timing, and atmospheric pressure systems. August 2024 saw Shanghai experience several days exceeding 35°C, whilst August 2023 recorded highs of 34–36°C across the month. These precedents suggest the eventual resolution will likely fall within established seasonal norms rather than extreme outliers.

Traders monitoring this contract should track seasonal weather pattern forecasts released by China's meteorological authority, typically issued with increasing precision from June onwards. Broader climate indices—including the East Asian summer monsoon strength and any developing El Niño or La Niña conditions—influence August temperatures across the region. The Shanghai Meteorological Bureau publishes monthly climate outlooks that may shift market expectations as 2026 approaches. Current 0% pricing reflects genuine uncertainty rather than confidence in any particular outcome; meaningful position-taking will likely emerge once June 2026 forecasts materialise.

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 PolyGram, which mirrors the Polymarket order book directly.

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

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 PolyGram. 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%.