Highest temperature in Shenzhen on July 16?

Platform comparison

Market context

Shenzhen will experience its peak daily heat on 16 July 2026 at the Bao’an International Airport station, with the market resolving to the specific Celsius range containing that maximum reading. The settlement relies on Wunderground’s historical daily data for ZGSZ, capturing the highest temperature recorded at any point during the calendar day.

Historical July peaks in Shenzhen typically cluster between 29°C and 33°C, making the current 0% crowd-implied probability for any outcome appear misaligned with seasonal norms. The frontrunner is 29°C at 38%, followed by 30°C at 29%, suggesting the market expects a moderate high rather than an extreme spike [1]. Programmatic traders should back-test past July 16 readings from the airport station to validate whether the zero-probability stance reflects a data anomaly or a genuine forecast of unusually cool conditions.

Key catalysts include real-time humidity shifts and cloud cover, which directly suppress peak temperatures; current conditions show 78% humidity and a RealFeel of 104°F despite 88°F air temperature, indicating strong evaporative cooling potential [2]. Traders building conditional order bots should monitor the UV index and wind speed updates from AccuWeather, as a UV index of 11 with 20 mph winds could either amplify or mitigate surface heating depending on cloud dynamics [2]. No official weather announcements are scheduled, so the dependency remains entirely on automated sensor feeds from the airport station.

Sources: 1 · 2 · 3

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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 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 Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.