Highest temperature in Shanghai on June 4?

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Market context

Shanghai's daily maximum temperature on 4 June 2026 will be recorded at Pudong International Airport Station and resolved against historical weather data. Early June in Shanghai typically sees temperatures in the 28–32°C range as the city transitions into its humid summer season, though heat waves can push readings several degrees higher. The 0% crowd probability suggests traders are either uncertain about which temperature band will resolve or are avoiding the market entirely due to the extended settlement window and granular range structure.

Historical June data from Shanghai shows considerable year-to-year variation. The city has recorded June highs exceeding 35°C during anomalous heat events, whilst cooler years see maxima around 26–28°C. The 2023 and 2024 June periods both featured temperatures in the upper 30s Celsius on multiple days, establishing a recent pattern of warmer-than-average early summer conditions. This historical context suggests the market's current zero probability may reflect genuine uncertainty rather than consensus that a particular temperature band is implausible.

Traders monitoring this contract should track seasonal weather forecasts released in May 2026, particularly any La Niña or El Niño signals that influence East Asian summer patterns. China's meteorological authority typically issues monthly outlooks by late April. Atmospheric pressure systems developing over the Pacific in late May will be the primary near-term catalyst affecting June 4th conditions. No scheduled infrastructure changes or measurement station relocations are anticipated before the settlement date.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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?

On Best Prediction Markets UK, 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.

Is this market available outside the US?

Best Prediction Markets UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, Best Prediction Markets UK triggers a quick verification flow that finishes in minutes.