Highest temperature in Shanghai on August 21?

Platform comparison

Market context

Shanghai's maximum temperature on 21 August 2026 will be recorded at Pudong International Airport Station and resolved against Weather Underground's Daily Observations table. The market currently shows 0% probability across all temperature ranges, suggesting traders have not yet engaged with the forecast or expect an unusual outcome.

August represents Shanghai's peak summer season, with historical daily highs typically ranging from 32–35°C. Data from the China Meteorological Administration shows that temperatures exceeding 37°C occur in roughly 15–20% of August days during heat waves, whilst readings below 30°C are rare. The settlement window closes at midday UTC on 21 August, creating a timing dependency: the highest temperature recorded by that point may not reflect the full day's peak if the hottest hours occur after noon local time (Shanghai UTC+8). This structural feature means traders must account for both seasonal norms and the specific measurement window.

Key variables affecting the outcome include the East Asian summer monsoon pattern, tropical cyclone activity in the Western Pacific, and Tibetan high-pressure systems—all of which influence Shanghai's August weather. The China Meteorological Administration typically issues 10-day forecasts by mid-August; traders should monitor these releases alongside any typhoon warnings that could suppress temperatures through cloud cover and precipitation. Historical precedent suggests that without extreme heat events, temperatures cluster in the 33–36°C band, making intermediate ranges more probable than the extremes currently priced at zero.

Methodology

This page tracks Highest temperature in Shanghai on August 21? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Trump Prediction provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

UK Frequently Asked Questions

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

Are political prediction markets legal in my country?

It varies. They sit in legal gray areas in most jurisdictions. Polymarket is geo-blocked from US/UK/EU; some broker frontends have a different geo footprint. Trade only with capital you can afford to lose, and only if you understand the legal status in your jurisdiction.

Are UK election prediction markets available from the UK?

Yes. Betfair Exchange and Smarkets offer UKGC-regulated UK election markets (seat counts, party share, constituency results). Polymarket also lists UK election contracts with deeper global liquidity. Betfair winnings are typically tax-free for UK individuals; Polymarket profits are subject to HMRC CGT.