Highest temperature in Shanghai on May 26?

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Market context

Shanghai's maximum temperature on 26 May 2026 will be measured at Pudong International Airport and resolved via Weather Underground historical data. The settlement window closes at midday UTC on that date, meaning traders must commit positions before final readings are confirmed. USDC settlement applies across all temperature bands, with no leverage or funding-rate mechanics tied to this contract.

Late May sits within Shanghai's late-spring transition period, when daily highs typically range between 28–32°C. Historical data from the past five years shows 26 May readings clustering around 29–31°C, with occasional spikes to 33°C during warmer years. The 0% crowd probability suggests either thin liquidity or genuine uncertainty about which temperature band will resolve. Comparable May weather markets on crypto platforms have seen sharp repricing once seasonal patterns become visible in early-month forecasts, so early-May weather reports will likely shift implied probabilities materially.

The key catalyst is the East Asian monsoon onset timing, which typically influences Shanghai precipitation and cloud cover in late May. China Meteorological Administration releases 10-day forecasts every three days; traders should monitor late-April and early-May updates for anomalies in upper-air patterns or tropical cyclone activity in the Western Pacific. Any significant deviation from the 30-year May average will compress or expand the probability mass across temperature bands. Settlement hinges entirely on Pudong station data, which has consistent historical records, eliminating ambiguity around measurement source.

Methodology

This page reads Highest temperature in Shanghai on May 26? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed for comparison. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

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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.

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