Highest temperature in Guangzhou on July 31?

Platform comparison

Market context

Polymarket is effectively pricing this contract at **0% YES** today, so the market is treating a Guangzhou airport high that lands in the contract’s YES range as extremely unlikely. For Polymarket users, the position is funded in **USDC** on **Polygon**, and the outcome is settled through the market’s **conditional tokens** against the Guangzhou Baiyun International Airport Station reading on Wunderground, so the live price reflects both weather expectations and the platform’s resolution mechanics rather than just a generic city forecast.

The historical frame does not support a near-zero price. Guangzhou’s July climate is typically hot and humid, with average highs around **32–33°C** and daily highs often around the low 30s, while some weather histories show July records reaching the high 30s Celsius.[3][4][5][15] Comparable late-July readings have also sat in the low 30s, including a recent July 31 historical high of **33.4°C** in one dataset, which is close to the month’s usual range rather than an extreme outlier.[2] That means traders are really reading whether the airport station gets a notably cooler day, not whether Guangzhou can ever be hot.

The main catalysts are the near-term forecast trend, any shift in rainfall or cloud cover over southern China, and whether the airport station follows the broader city pattern or runs hotter than published city averages. Guangzhou’s July weather is often rainy and humid, and even small changes in convection or afternoon showers can move the day’s maximum materially.[4][6][18] Because the settlement window ends at **12:00 UTC**, the relevant print is the highest temperature logged before that cutoff on Wunderground, so Polymarket holders need to watch the intraday run-up on the airport observation rather than only the day’s headline forecast.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track 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 PolyGram. 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'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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.