Highest temperature in Shanghai on May 25?

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Market context

Shanghai's weather on 25 May 2026 will be measured against historical May temperatures at Pudong International Airport, the city's primary meteorological observation point. Late May in Shanghai typically falls within the pre-monsoon transition period, with average daily highs around 28–30°C, though variability increases as the region approaches the East Asian summer monsoon onset. The settlement mechanism relies on Wunderground's historical weather database, which aggregates readings from the airport station throughout the day to determine the single highest temperature recorded.

Historical precedent suggests May temperatures in Shanghai cluster predictably within established ranges. Over the past two decades, daily highs on 25 May have ranged from approximately 22°C to 34°C, with most years falling between 26–32°C. Anomalously high readings above 33°C occur in roughly one year per decade during this calendar date, typically driven by early-season heat waves or subtropical high-pressure systems moving northward ahead of monsoon arrival. The current 0% crowd probability indicates traders are pricing out extreme heat scenarios, reflecting baseline seasonal expectations rather than forecasted anomalies.

Traders monitoring this market should track seasonal weather pattern forecasts released by China's National Meteorological Centre in the weeks preceding late May 2026, particularly any advisories regarding early heat waves or monsoon timing shifts. El Niño or La Niña conditions active during spring 2026 could influence subtropical pressure systems and thus May temperatures. Real-time atmospheric data from late April and early May will provide the most actionable signals, as short-range forecasting accuracy improves substantially within two weeks of the settlement date.

Methodology

This page tracks Highest temperature in Shanghai on May 25? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. PolyGram routes every trade through to Polymarket — at 0% fees.

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

Where can I trade this market with the lowest fees?

On PolyGram, 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 PolyGram?

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

Do I need to KYC for this market?

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