Highest temperature in Guangzhou on July 4?

Platform comparison

Market context

Guangzhou is entering its peak summer phase, with meteorological agencies forecasting a July 4 maximum near 31°C at the Baiyun International Airport. This real-world expectation clashes sharply with the current crowd-implied probability of 0% for a "YES" outcome on this specific contract, suggesting a significant divergence between analyst consensus and the market's binary framing. While sportsbooks and prediction markets often align on temperature ranges, the zero probability here implies traders may be misinterpreting the resolution threshold or betting against a specific temperature bracket that excludes the forecasted 31°C.

Historical data frames this probability as an outlier rather than a baseline. July is consistently Guangzhou's hottest month, with average daily highs hovering between 33°C and 35°C, and records reaching 39°C in 2024[4][9]. The UK Met Office and China Meteorological Administration both place typical July highs around 31°C to 33°C, rarely dipping below 28°C[1][2]. The low odds for temperatures below 30°C or above 36°C in comparable markets confirm that 31°C sits squarely within the expected range, making the 0% implied probability a stark contrast to decades of climatology[3].

Traders should monitor the daily weather updates from Wunderground, the official resolution source, as the settlement window closes at 12:00 UTC on 4 July[1]. The primary catalyst is the hourly temperature log, which will determine if the peak hits the 31°C threshold forecasted by agencies. Recent reports from Xinhua News Agency highlight that Guangzhou has experienced its longest summer since 1961, reinforcing the likelihood of sustained high temperatures[8]. Any deviation from the 31°C forecast would be a critical signal, but current climatology strongly supports the temperature range implied by the 34% frontrunner for 32°C on Polymarket[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Guangzhou on July 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 Best Prediction Markets. 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.

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.