Highest temperature in Shanghai on July 21?

Platform comparison

Market context

Shanghai faces a day of mostly cloudy skies with local thunderstorms possible this afternoon, yet the crowd-implied probability of any specific high-temperature range remains at zero per cent, suggesting the market currently lacks a defined directional bet for the 21 July 2026 peak heat. This null probability is unusual for a mid-summer weather event in a city that routinely experiences extreme heat, indicating either a data gap in the resolution source or a collective hesitation to commit before the day’s final readings are confirmed.

Historically, Shanghai’s July highs at Pudong International Airport frequently exceed 35°C, with records reaching 39°C in recent years, making a zero-per-cent probability across all ranges statistically inconsistent with typical climatic behaviour. Comparable cases from 2023 and 2024 show consistent high-temperature clusters between 34°C and 38°C, framing the current market as an outlier that likely awaits a catalyst to align with historical norms rather than reflecting an actual absence of heat risk.

Traders should monitor real-time updates from Wunderground, the designated resolution source, as the day progresses toward the 12:00 UTC settlement window, watching for any sudden shifts in cloud cover or thunderstorm intensity that could suppress temperatures below expected ranges. No scheduled political debates or campaign-finance disclosures influence this weather market, but the primary catalyst remains the live meteorological data itself; a Reuters weather bulletin or a MeteoBlue update confirming a temperature spike would likely trigger immediate poll movements to correct the current 0% anomaly.

Sources: 1

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Shanghai on July 21? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

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.

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.