Highest temperature in Shanghai on August 17?

Platform comparison

Market context

Shanghai's maximum temperature on 17 August 2026 will be measured at Pudong International Airport Station and resolved against Weather Underground's Daily Observations table rather than the Day High & Low summary—a distinction that matters for edge cases where automated feeds diverge. The settlement window closes at midday UTC, creating a hard cutoff for final readings. For programmatic traders, this means building resolution verification logic that queries the specific data table rather than relying on headline figures, since Weather Underground's interface presents multiple temperature records that can occasionally conflict.

August in Shanghai typically sees daily highs between 32–35°C, with occasional peaks above 36°C during heat waves. Historical data from the past decade shows that extreme heat events (38°C+) occur roughly once every two to three years during mid-August, whilst temperatures below 30°C are rare enough to be noteworthy. The current 0% crowd probability suggests traders are pricing in a specific temperature threshold that historical patterns make unlikely, though without visibility into the exact range boundaries, this reflects either confidence in a cooler-than-typical August or consensus around a high threshold.

Traders monitoring this market should track China Meteorological Administration forecasts and any tropical cyclone activity in the Western Pacific, as late-summer storm systems can suppress temperatures across the Yangtze River Delta region. Recent monsoon patterns and sea surface temperatures in the East China Sea will influence whether atmospheric conditions favour heat accumulation or cloud cover on that date. Conditional order logic could be structured around official typhoon warnings or 10-day ensemble forecast updates from major meteorological services, which typically stabilise 5–7 days before the settlement date.

Methodology

We track Highest temperature in Shanghai on August 17? 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 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%.