Highest temperature in Shanghai on July 20?

Platform comparison

Market context

Shanghai faces a sweltering July 20, 2026, with the highest temperature at Pudong International Airport expected to exceed 34°C, rendering the market’s 0% YES probability for lower ranges historically implausible. Current forecasts indicate a maximum of 38°C under scattered clouds and potential thunderstorms, aligning with typical mid-summer heatwaves in the region [2][3].

Historical data from July in Shanghai consistently shows peak temperatures between 34°C and 38°C, making outcomes below 34°C exceptionally rare. The adjacent market for the lowest temperature on this date already assigns 94% probability to 27°C, reinforcing that daytime highs will comfortably surpass the threshold implied by the current 0% YES pricing [1]. This pattern mirrors recent years where July 20 highs rarely dip below 35°C, suggesting the market is mispricing the likelihood of extreme heat.

Traders should monitor real-time updates from Wunderground, the official resolution source, as afternoon thunderstorms could temporarily suppress peak temperatures. Meteorological models from Meteoblue forecast a 70% chance of precipitation and temperatures reaching 91°F (38.3°C), which may shift probability if storms intensify [2]. No political catalysts apply here, but weather-dependent dependencies like storm timing and cloud cover will dictate the final resolution.

Sources: 1 · 2 · 3 · 4

Methodology

This page tracks Highest temperature in Shanghai on July 20? 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

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.

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.

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.