Pronóstico: Highest temperature in Shenzhen on July 31?

Platform comparison

Market context

Polymarket is pricing this Shenzhen temperature contract at **0% YES** right now, which means the market is paying almost nothing for a July 31 high that lands in the specified bucket, even though the underlying settlement will be based on the **highest daily temperature at Shenzhen Bao'an International Airport Station** in Celsius. The event itself is straightforward: if the airport station prints a sufficiently hot afternoon maximum before the settlement window closes, the contract resolves accordingly; if not, it settles outside that range. Because the market uses **USDC** and **conditional tokens on Polygon**, traders are effectively marking the probability of a single weather reading rather than the broader citywide feeling of “hot weather”.

Shenzhen’s late-July climate makes the contract easy to frame against history. July averages are around **31°C** for daytime highs, with Shenzhen’s all-time record high cited at **36.4°C**, so the market is not betting on an unprecedented heat spike so much as on whether today’s airport observation clears the threshold needed for the chosen range[1][2][18]. Comparable late-July days in Shenzhen often sit in the low-to-mid 30s, with humidity and rain strongly influencing whether the daily maximum is capped early or climbs later in the afternoon[2][15]. In practical terms, a 0% price suggests traders see the contract’s target band as far above the most likely realised high, not merely above the monthly average.

For a Polymarket user, the main catalysts are the local forecast path, cloud cover, rain timing, and any shift in synoptic conditions over Guangdong that changes whether Shenzhen Bao'an Airport gets a clean heating window before the daily peak. The relevant reference point is the airport station’s own history page, so intraday airport-specific observations matter more than city averages or generic Shenzhen forecasts[10][16]. If nearby convection builds or a rain band arrives earlier than expected, the high can be suppressed quickly; if skies clear for even a few hours, the afternoon maximum can run closer to the climatological July peak. The settlement window ends at **12:00 UTC**, so the final reading should be watched with the usual time-zone conversion in mind.

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.

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.