Highest temperature in Shanghai on July 11?

Platform comparison

Market context

Shanghai is entering its peak summer heatwave period, with July 11 historically marking the onset of sustained temperatures above 30°C at the Pudong International Airport station. The market’s 0% YES probability for any specific low-range outcome reflects the region’s consistent climatic behaviour, where daytime highs routinely exceed 35°C during mid-July, often reaching 38°C or higher in recent years [3][6]. Historical data shows that July highs at ZSPD average between 30.7°C and 32°C, with 2025 recording a peak of 38°C, making lower temperature brackets statistically implausible for this date [6][9].

Traders should monitor real-time meteorological updates from Wunderground and local forecasts from AccuWeather, which currently indicate highs near 30°C for Saturday 11 July, with a chance of thunderstorms that could temporarily suppress peak temperatures [4][10]. While no political debates or campaign disclosures influence weather outcomes, the primary catalyst remains the arrival of the “plum rain” season’s tail end, which typically brings humid, hot conditions with intermittent heavy precipitation [6]. The market leans on the absence of extreme cooling events, as Shanghai’s urban heat island effect and high solar radiation (rising to 5.6 kWh daily in July) reinforce high temperature floors [1][3]. Any deviation below 30°C would require an unusual cold front, which current forecasts do not support.

Sources: 1 · 2 · 3 · 4 · 5

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 11? 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.

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.