Highest temperature in Shenzhen on July 27?

Platform comparison

Market context

Polymarket is pricing this Shenzhen airport temperature contract with **30°C** and **31°C** tied as the front runners at **27% each**, while the crowd-implied probability for a **0% YES** outcome indicates the market is still spread across the full range rather than leaning hard into an extreme print.[1] On Polymarket, positions are backed by USDC on Polygon and settle through conditional tokens, so each temperature band is effectively a claim on the official Wunderground reading at Shenzhen Bao'an International Airport Station for 27 July.[1]

For context, Shenzhen’s July climate normally sits in the low 30s by day, with a monthly daytime average of about **32°C** and night-time lows around **26°C**.[2] That makes mid-30s outcomes possible but not routine, and it also explains why the market tends to cluster around the low- to mid-30s rather than the hottest bands. In practice, traders read this as a weather-range contract rather than a binary hot/cool bet: the payout depends on where the airport station’s maximum lands, not on conditions elsewhere in the city.[1][2]

The main catalysts are the day’s actual temperature path, cloud cover, rainfall, and any late-morning convective showers that can cap the high before the settlement window closes at 12:00 UTC. Because resolution uses the station page on Wunderground, traders are watching the official hourly progression rather than forecasts alone, and any update that shifts the expected peak by even one degree can move the quoted band probabilities on-chain.[1]

Sources: 1 · 2

Methodology

We track Highest temperature in Shenzhen on July 27? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Alternative UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.