Highest temperature in Shenzhen on May 31?

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Market context

Shenzhen's maximum temperature on 31 May 2026 will be recorded at Bao'an International Airport and resolved against historical weather data. The market currently shows 0% implied probability across all temperature bands, suggesting either incomplete pricing or a technical issue with the market setup, as some outcome must occur on the day in question.

Late May in Shenzhen typically sits within the pre-monsoon transition period, with daily highs ranging between 28°C and 34°C based on thirty-year climate normals. The city experiences increasing humidity and occasional rainfall as the southwest monsoon approaches, though sustained heat waves remain possible. Historical May 31st data from Bao'an shows considerable year-to-year variation; temperatures have ranged from lows of 26°C to highs exceeding 35°C depending on whether subtropical high-pressure systems dominate or monsoon moisture arrives early. The 0% crowd probability likely reflects uncertainty about which temperature band the market offers rather than genuine doubt about whether a maximum will be recorded.

Traders should monitor May 2026 seasonal forecasts released by the China Meteorological Administration in the weeks preceding settlement, as these typically indicate whether anomalous heat or early monsoon activity is expected. Sea surface temperatures in the South China Sea and the timing of the southwest monsoon onset—typically occurring between mid-May and early June—will be critical drivers. Real-time weather models become reliable only within ten days of the event, so early positioning should account for the broad seasonal range rather than specific daily predictions.

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

Is this market available outside the US?

Who Will Win 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.

What does it cost to trade on Who Will Win?

Zero. Who Will Win 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.