Highest temperature in Shanghai on July 4?

Platform comparison

Market context

Shanghai’s July 4, 2026, high temperature at Pudong International Airport is the real-world event determining this prediction market’s outcome. Historical data shows daily highs in early July typically reach 28–33°C, rarely dipping below 25°C or exceeding 35°C, with average highs climbing from 84°F to 88°F as the month progresses[1]. Summer conditions regularly exceed 30°C, peaking at 35°C under intense sun[4].

Current crowd-implied probability of 0% YES for any outcome below 32°C starkly diverges from trader consensus on Polymarket, where 32°C holds 34–36% implied probability and 33°C leads at 37% across market versions[2][3]. This suggests the market expects temperatures near seasonal norms, not the extreme lows implied by the 0% line. Traders should monitor the Shanghai Meteorological Bureau’s daily forecasts and Wunderground’s real-time updates for July 4, especially as recent reports note Pudong temperatures exceeding 40°C in prior summers, though such extremes remain outliers[8]. Ensemble forecasts from global models currently cluster peak readings near 32–33°C, reinforcing the market’s directional bias[2].

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Kalshi vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi vs Polymarket 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.