Highest temperature in Shanghai on August 15?

Platform comparison

Market context

Shanghai's peak temperature on 15 August 2026 will be determined by monsoon intensity and any tropical systems tracking towards the Yangtze River Delta during mid-August. The current 0% crowd probability suggests traders expect conditions substantially cooler than the market's upper threshold, though August typically ranks among Shanghai's hottest months with historical daily maxima regularly exceeding 35°C.

August 15 falls within Shanghai's peak summer heat period, when the Western Pacific subtropical high-pressure system dominates. Historical data from Shanghai Pudong International Airport shows August averages around 32–33°C for daily highs, with extremes reaching 37–38°C during particularly intense heat waves. The 2013 heat wave pushed temperatures to 38.3°C on 6 August; more recently, August 2022 saw multiple days above 36°C. The zero probability assigned here suggests the market's temperature brackets may be positioned substantially above typical August conditions, making resolution contingent on an unusually severe heat event.

Traders should monitor tropical cyclone forecasts from the China Meteorological Administration and Japan Meteorological Agency from late July onwards, as typhoons approaching or crossing the region can either suppress temperatures through cloud cover and precipitation or intensify heat through pre-system conditions. Sea surface temperatures in the East China Sea and Bay of Bengal will influence monsoon strength. Weather Underground's Daily Observations table, specified as the resolution source, typically updates observations from Pudong station throughout the day, with final readings locked at the settlement window on 15 August at 12:00 UTC.

Methodology

We track Highest temperature in Shanghai on August 15? 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

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%.