Highest temperature in Shanghai on August 19?

Platform comparison

Market context

Shanghai's weather on 19 August 2026 will determine which temperature band captures the day's peak reading at Pudong International Airport. The market currently prices all outcome ranges at 0% YES, reflecting the settlement window's closure date being nearly two years away. On Polymarket, this contract trades as a set of mutually exclusive conditional tokens on Polygon, denominated in USDC, with resolution hinging on Weather Underground's Daily Observations table rather than its summary display—a distinction that matters when hourly readings diverge from headline figures.

August in Shanghai typically sees maximum temperatures between 32–36°C, with occasional peaks above 37°C during heat waves. Historical data from the past decade shows mid-August highs clustering around 33–35°C, though 2013 and 2017 both recorded 38°C+ readings during particularly intense subtropical pressure systems. The current zero-probability pricing reflects the market's nascent state; as the settlement date approaches and seasonal patterns become clearer, traders will calibrate positions based on whether atmospheric conditions favour typical monsoon-moderated heat or anomalous continental air masses pushing temperatures into the upper ranges.

Traders monitoring this contract should track China's meteorological forecasts from late July onwards, particularly alerts from the China Meteorological Administration regarding high-pressure systems or heat warnings. El Niño or La Niña conditions in the Pacific influence East Asian summer circulation patterns and warrant attention to seasonal outlooks published by international centres. Real-time updates from Pudong station itself become actionable only in the final week, but longer-range ensemble models from mid-August will provide the first substantive signal for repricing the conditional token distribution.

Methodology

This page reviews Highest temperature in Shanghai on August 19? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Scam?, which mirrors the Polymarket order book at 0% fees.

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 Scam?. 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%.