Highest temperature in Shanghai on May 23?

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Market context

Shanghai's maximum temperature on 23 May 2026 will be recorded at Pudong International Airport Station and resolved via Wunderground historical data. Late May in Shanghai typically sees highs between 28–32°C, though anomalies occur; the city's subtropical climate can produce readings above 35°C during early heat waves or remain below 25°C during cooler frontal passages. The settlement window closes at midday UTC, meaning traders must account for the full calendar day's temperature range recorded at the official station before that timestamp.

Historical May temperatures at Shanghai Pudong show considerable year-to-year variance. In May 2023, the highest daily maximum reached 31.5°C; in May 2022, it peaked at 33.8°C. The 0% crowd probability reflects genuine uncertainty rather than consensus that cooler ranges are certain—such extreme confidence in weather markets typically signals either thin liquidity or a misalignment between the range bins offered and expected outcomes. Comparable late-spring Shanghai markets have historically seen probability mass distributed across the 28–34°C bands, with tail ranges (sub-22°C or above 36°C) attracting minimal backing.

Traders should monitor China Meteorological Administration seasonal forecasts and any El Niño or La Niña updates issued before late May 2026, as these influence regional temperature patterns. Wunderground's historical archive for Pudong is reliable and widely used for settlement; verification of the exact station reading is straightforward once the day concludes. From a regulatory standpoint, this weather derivative falls under German GlüStV oversight if offered to EU residents, whilst US CFTC reach extends to US persons regardless of geography. Markets under $1,500 notional typically operate without KYC requirements on many platforms, though individual operators' policies vary; traders should verify their platform's specific accessibility terms before committing capital.

Methodology

This page reviews Highest temperature in Shanghai on May 23? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 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.

Is this market available outside the US?

PolyGram 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.

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.

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.