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 recorded in Weather Underground's Daily Observations table, which serves as the authoritative resolution source should it diverge from the Day High & Low summary. The market resolves to a temperature range bracket containing that single highest reading in degrees Celsius during the calendar day.

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 five years shows that extreme temperatures (above 37°C) occur roughly 15–20% of the time in mid-August, whilst readings below 30°C are rare. The 0% crowd probability suggests traders are either awaiting updated seasonal forecasts or treating this as a calibration exercise; comparable August markets in Shanghai have rarely settled below 31°C or above 39°C. Reviewing Weather Underground's historical station data for Shanghai Pudong provides the baseline distribution needed to evaluate which temperature bracket offers value.

Traders monitoring this market should track China Meteorological Administration updates and any typhoon activity in the Western Pacific during early-to-mid August 2026, as tropical systems can suppress temperatures significantly. For programmatic approaches, integrating Weather Underground's API to pull Daily Observations data directly—rather than relying on summary displays—ensures settlement-source alignment. Setting conditional orders tied to forecast model consensus (GFS, ECMWF) issued 7–10 days prior would allow automated position adjustments as confidence in specific temperature ranges shifts.

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 Bot UK, which mirrors the Polymarket order book at 0% fees.

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

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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%.