Highest temperature in Shanghai on July 4?

Platform comparison

Market context

The real-world event hinges on the peak heat recorded at Shanghai Pudong International Airport on 4 July 2026, measured in degrees Celsius and sourced from Wunderground. Current market sentiment assigns zero probability to the "YES" outcome, implying the crowd believes the temperature will fall outside the specific range being traded, despite July being the hottest month in Shanghai with average highs near 31°C (87°F)[3].

Historical data shows summer highs regularly exceed 30°C, often reaching 35°C during sunny spells, with July 29 marking the peak average high of 88°F (31.1°C) for the month[1][5]. The zero probability suggests traders are betting the temperature will miss the narrow bracket, perhaps due to an anticipated cloud cover or rain event that would suppress the peak, contrasting with the typical clear, solar-rich conditions that drive temperatures toward 35°C[1][6].

Traders should monitor the upcoming weather forecasts for Shanghai Pudong, which currently predict daily highs between 26.7°C and 34.4°C (80°F to 93°F) for July 2026, alongside any sudden shifts in wind speed or solar energy that could alter the peak[1][6]. The market leans heavily on the Wunderground temperature reading for that specific day, making the 12:00 UTC settlement window critical for final verification, with no major political debates or campaign disclosures expected to influence this purely meteorological outcome[6].

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 4? 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

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

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.

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 Trump Prediction route into the same order book at 0% fees.

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.

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.