Highest temperature in Shanghai on July 21?

Platform comparison

Market context

Shanghai's weather on 21 July 2026 will be measured against historical temperature records for that specific date at Pudong International Airport, the city's primary meteorological observation point. July represents the peak of Shanghai's summer monsoon season, when daily highs consistently exceed 30°C and occasionally reach the mid-to-high 30s. The settlement mechanism relies on Wunderground's historical weather database, which aggregates official station data and provides the definitive highest temperature reading for the day.

Historical July temperatures at Shanghai Pudong show considerable year-to-year variation. Over the past two decades, 21 July highs have ranged from approximately 28°C to 37°C, with most years clustering between 32°C and 35°C. The 0% crowd probability suggests traders are either awaiting clearer seasonal forecasts or treating this as a calibration exercise given the eighteen-month forecast horizon. Comparable markets on Shanghai summer temperatures typically see meaningful probability shifts only when seasonal weather patterns become discernible, typically within three to six months of the settlement date.

Traders should monitor long-range climate forecasts from China's Meteorological Administration and international seasonal models as 2026 approaches. El Niño or La Niña conditions, which influence East Asian summer patterns, will become clearer by early 2026. Additionally, any significant shifts in the Atlantic Meridional Overturning Circulation or Indian Ocean temperatures could affect monsoon intensity over Shanghai during July. Current probability distribution likely reflects genuine uncertainty rather than information asymmetry, given the extended timeframe before meaningful meteorological data becomes available.

Methodology

This page tracks Highest temperature in Shanghai on July 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 Election Predictions UK 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.

FAQ

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

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.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Election Predictions UK route into the same order book at 0% fees.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.