Pronóstico: Highest temperature in Guangzhou on July 31?

Platform comparison

Market context

Polymarket is pricing this Guangzhou airport temperature contract at **0% YES** right now, which means the market is effectively saying a qualifying high in the target range is not expected to land on the day. For a user holding USDC on Polygon, the practical question is not Guangzhou’s abstract weather outlook but whether the highest recorded temperature at Guangzhou Baiyun International Airport Station, as published on Wunderground, finishes inside the settlement band before the window closes at 12:00 UTC.

That pricing sits against a familiar July baseline for Guangzhou: multiple forecast and climate references put daytime highs in the low 30s Celsius, with July commonly described as hot, humid and rainy, and daily highs often around 30-33°C, occasionally pushing into the mid-30s.[1][3][7][11][18][19] Wunderground’s own live Guangzhou readings have recently shown mid-30s-adjacent conditions elsewhere in the city, while BBC observations from Guangzhou/Baiyun Airport put the station at 30°C with very high humidity, underlining that the location can still run warm even when showers are around.[4][8] On that basis, a 0% crowd price reads less like a call that the airport will be cold and more like a view that the relevant band is either narrow, poorly defined, or currently seen as hard to reach from the day’s realised maximum.

What matters for traders is the sequence of intraday weather updates, not just the morning forecast. Guangzhou’s July pattern is frequently wet, with thunderstorms or heavy showers shown in several forecast sources for 31 July, alongside high precipitation probabilities and humidity that can suppress or delay peak temperatures.[2][3][6][7] If skies brighten around peak heating hours, the airport maximum can still move quickly; if rainfall arrives earlier, the high may be set early and hold. The contract settles from the Wunderground history page for Guangzhou Baiyun International Airport Station, so traders are really watching for the station’s final daily high rather than broader city averages.[1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Guangzhou on July 31? 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

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.