Highest temperature in Shanghai on May 23?

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Market context

Shanghai's highest temperature on 23 May 2026 will be measured at Pudong International Airport Station and resolved against Wunderground's historical records. The current market pricing reflects near-zero conviction across all temperature bands, suggesting traders are either awaiting seasonal forecasts or treating this as a placeholder contract. On Polygon, USDC-denominated conditional tokens for each temperature range are trading with minimal volume, typical for weather markets settling over eighteen months away.

Shanghai's May climate sits at the threshold between spring and early summer, with historical highs clustering between 28–32°C depending on weather systems. Data from the past five years shows May 23 specifically has ranged from 26°C to 31°C, with 2021 recording 29°C and 2023 reaching 30°C. This seasonal consistency—warm but not extreme—provides the baseline against which traders should calibrate their positions. The 0% probability across all bands suggests the market has not yet attracted serious participation rather than reflecting genuine uncertainty about whether Shanghai will experience any temperature at all.

Traders should monitor China's meteorological forecasts released in early May 2026, particularly alerts regarding subtropical high-pressure systems or monsoon activity that could push temperatures into the 32–35°C range. Historical patterns show that late-May heat waves in the Yangtze River Delta region correlate with early-season typhoon precursors, though these typically arrive after the 23rd. Settlement depends entirely on Wunderground's archival data from the official airport station, making source reliability the primary non-weather consideration for position sizing.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.

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 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 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.