Highest temperature in Shanghai on July 4?

Platform comparison

Market context

The real-world event hinges on the peak temperature recorded at Shanghai Pudong International Airport on 4 July 2026, measured in degrees Celsius and resolved via Wunderground data. This single-day metric determines the market outcome, with the settlement window closing at 12:00 UTC on the day itself.

Historical patterns for Shanghai in July show daily highs typically ranging from 29°C to 35°C, rarely dipping below 24°C or exceeding 38°C, with average highs climbing from 29°C to 31°C as the month progresses[1][6]. The current crowd-implied probability of 0% for any outcome appears inconsistent with these norms, as even the frontrunner outcomes (33°C at 37% and 34°C at 27%) suggest a non-zero chance of extreme heat[2][3]. A programmatically trained bot would flag this discrepancy by back-testing Wunderground archives for ZSPD on 4 July across prior years, noting that temperatures exceeding 30°C are standard in summer, often reaching 35°C under sunny conditions[6].

Traders should monitor the Shanghai Meteorological Bureau’s daily forecasts and real-time alerts for heatwaves, particularly given recent reports of Pudong district temperatures exceeding 40°C in early summer[8]. Dependencies include cloud cover, wind speed (averaging 11.3–12.4 mph in July), and solar energy incidence (rising from 5.1 to 5.6 kWh)[1]. A conditional order strategy would trigger buys if Wunderground’s hourly data shows temperatures surpassing 32°C by midday, while shorting if persistent cloud cover or rain is forecasted. Recent news confirms Shanghai’s capacity for extreme heat, with a preliminary high of 40.9°C recorded at Xujiahui station earlier this year[9], reinforcing the need for data-driven vigilance rather than dismissing the market as zero-probability.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on July 4? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Bot UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.