Highest temperature in Shanghai on August 19?

Platform comparison

Market context

Shanghai's peak temperature on 19 August 2026 will be measured at Pudong International Airport Station and resolved against Weather Underground's Daily Observations table rather than the summary high-low figures. The distinction matters: automated systems querying the primary data source will capture intraday temperature spikes that summary sections sometimes smooth or delay. For traders building conditional order logic or bot-based monitoring, the resolution source demands direct API access to Wunderground's granular observation records, not screen-scraping the public forecast interface.

August in Shanghai typically peaks between 32–36°C, with occasional excursions toward 37–38°C during heat waves. Historical data from the past five years shows that extreme heat events—those pushing above 37°C—occur in roughly 15–20% of August days at Pudong. The 0% crowd probability suggests either confidence in a cooler-than-average day or insufficient liquidity to price tail-risk scenarios. Traders should cross-reference seasonal patterns: late August often sees marginal cooling as tropical systems approach, though 2026's specific atmospheric setup remains unknown at this distance.

The relevant catalyst is the Western Pacific typhoon season's progression through early-to-mid August. The China Meteorological Administration typically issues heat alerts 3–5 days ahead of extreme events, providing a leading indicator for conditional orders. Traders automating this market should monitor CMA advisories and sea-surface temperature anomalies in the East China Sea from mid-August onwards; these drive convective activity and surface heating patterns that determine whether Pudong records a routine summer day or an outlier peak.

Methodology

We track Highest temperature in Shanghai on August 19? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

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%.