Pronóstico: Highest temperature in Guangzhou on August 4?

Platform comparison

Market context

Polymarket has this Guangzhou heat contract pinned at **0% YES** right now, even though the market settles on the highest temperature recorded at Guangzhou Baiyun International Airport Station on 4 August and the outcome is still being measured against Wunderground’s daily history page. Because settlement is in **USDC** on **Polygon**, the price reflects the crowd’s view of where the conditional tokens should ultimately resolve, not a direct forecast of the city’s ordinary weather. The live setup matters here: any late-day spike in the airport station’s reported maximum can still flip a previously dismissed band if the official daily high lands inside it.

The historical frame is straightforward: Guangzhou in August is normally hot, humid and rain-prone, with multiple forecast sources putting typical daily highs around **33–34°C** and August averages near **91°F**. Wunderground-linked comparables and weather services also show a lot of daytime tops in the low-to-mid 30s Celsius, while some individual days can run a little hotter when cloud cover breaks and convection stays late. That means a **0%** market implies traders think the available temperature ranges do not line up with the likely airport-observed maximum, rather than believing the city will be cool. In practice, users watching the book should focus on whether the implied band sits above or below the customary August high rather than on headline “feels like” readings.

For catalysts, the key inputs are the airport station’s reported maximum, not downtown conditions, and the main dependency is whether showers or thunderstorms cap the afternoon heat. Recent forecast guidance has already shown **heavy showers** and highs around **33°C** for 4 August, which is consistent with Guangzhou’s broader August pattern of frequent rain and persistent humidity. Traders should also watch for any forecast updates from the morning through the local afternoon, because a delayed clearing can materially change the day’s peak before the Wunderground history record closes.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Guangzhou on August 4? 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.

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.

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 Qué Es 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.