Highest temperature in Shanghai on June 4?

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Market context

Shanghai's weather on 4 June 2026 will be measured at Pudong International Airport Station, with the market resolving to whichever temperature band captures the day's high. Early June falls within Shanghai's transition into summer, when daily maximums typically range between 28–32°C, though heat waves can push readings several degrees higher. The 0% crowd probability suggests traders are either uncertain about the specific temperature thresholds offered or treating this as a placeholder market awaiting clearer range definitions.

Historical June data from Shanghai shows considerable year-to-year variation. The city recorded 35.1°C on 4 June 2013 and 32.8°C on 4 June 2019, illustrating how a single date can span nearly 3°C depending on synoptic patterns. Seasonal monsoon positioning and any early-summer high-pressure systems will be decisive; tropical systems occasionally bring cooler, wetter conditions instead. Traders should reference the specific temperature bands the market eventually lists, as the crowd's current indifference likely reflects missing granularity rather than genuine uncertainty about whether Shanghai will be warm on that date.

The settlement window closes at midday UTC on 4 June 2026, requiring Wunderground's historical records to be updated and accessible by that time. Traders should monitor Shanghai's weather patterns from late May onwards; any significant anomalies in the weeks preceding the date—such as unusual cold fronts or early heat waves—would shift expectations for early June conditions. Wunderground's station data has historically been reliable for Chinese cities, though occasional reporting delays have occurred during extreme weather events.

Methodology

We track Highest temperature in Shanghai on June 4? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Champions League Prediction, which mirrors the Polymarket order book at 0% fees. 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.

What does it cost to trade on Champions League Prediction?

Zero. Champions League Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.