Highest temperature in Shenzhen on May 31?

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Active sub-markets

Market context

Shenzhen's late May weather sits at the threshold between spring and summer, with the city transitioning into its pre-monsoon season. Historical data from Bao'an International Airport shows May 31st typically records highs between 28–32°C, though extremes have occasionally pushed toward 34°C during particularly warm years. The settlement mechanism relies on Wunderground's historical weather archive for the airport station, which logs hourly observations and derives daily maxima from continuous monitoring rather than discrete readings. For programmatic traders, this creates a straightforward data dependency: the resolution hinges entirely on a single publicly accessible source updated in near-real time, eliminating ambiguity around measurement location or methodology.

The 0% crowd probability reflects rational scepticism about extreme heat on this specific date rather than any data gap. Shenzhen's May climate is volatile—subtropical systems can deliver cooler, wetter conditions, whilst high-pressure ridges occasionally drive temperatures above 33°C. Traders evaluating this market should monitor the China Meteorological Administration's seasonal forecasts and track upper-air pattern shifts in late May 2026, particularly the position of the Pacific anticyclone relative to southern China. Recent years show increasing frequency of early-season heat events in the region, though May 31st remains climatologically moderate compared to June onwards. Conditional orders tied to specific forecast thresholds—such as triggering buys if 10-day outlooks show persistent high-pressure anomalies—would allow systematic exposure without manual daily monitoring.

Methodology

We track Highest temperature in Shenzhen on May 31? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Review UK, 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?

Polymarket Review UK 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 Polymarket Review UK?

Zero. Polymarket Review UK 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.