Highest temperature in Shenzhen on August 5?

Platform comparison

Market context

The market is pricing the Shenzhen Bao’an Airport high for 5 August at **0% for YES**, so Polymarket traders are effectively assigning no value to the contract’s listed outcome range today. On-chain, that means positions are settled in **USDC** on **Polygon** through conditional tokens, with the usual binary market mechanics: if the recorded airport high lands in the specified range, the relevant token redeems at $1; if not, it settles at zero.

For context, Shenzhen’s early-August climate is typically hot, humid and rain-prone, with published August norms around the low 30s Celsius and frequent showers rather than cool afternoons.[1][2][6][18] Forecast services for this period also point to highs around 31–32°C, with day-to-day variation but little sign of an anomalously cool pattern that would push the airport maximum outside the market’s target band.[1][4][7] That makes a zero-price contract consistent with a view that the named range is unlikely to be the day’s peak reading.

The main catalysts are the same ones that move airport-temperature markets in practice: the intraday temperature path, convective rain or thunderstorms, and the timing of any late-afternoon heat spike before the settlement window closes. Shenzhen’s August weather is often described as having many rainy days and substantial precipitation, so a trader would watch for cloud cover, showers and wind shifts that cap the day’s maximum.[2][18] For resolution, the key reference is the **Wunderground history page** for Shenzhen Bao’an International Airport Station, so the market will track the recorded daily high there rather than the city-wide forecast alone.

Sources: 1 · 2 · 3 · 4 · 5

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.

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.