Highest temperature in Guangzhou on July 4?

Platform comparison

Market context

Guangzhou experiences its most intense heat during July, when daily highs typically reach 33°C to 35°C, making a temperature of 31°C or higher statistically expected rather than exceptional. In prediction markets, a YES share represents a bet that the market’s specific condition will occur—here, that the highest temperature on 4 July 2026 falls within a defined range—while a NO share bets it will not. The current crowd-implied probability of 0% YES suggests traders believe the threshold is either already met or irrelevant, yet historical data from the China Meteorological Administration confirms July averages consistently exceed 31°C[3].

Past records show Guangzhou’s July daily highs rarely dip below 28.3°C, with most days clustering around 33°C to 35°C, reinforcing that 31°C is a low bar for this season[1][7]. Traders should monitor real-time updates from Wunderground, the official resolution source, and watch for any official announcements from the Guangzhou Meteorological Bureau regarding heatwave advisories or station recalibrations. Recent coverage by Xinhua News Agency noted Guangzhou recorded its longest summer since 1961, indicating sustained high temperatures that further validate the likelihood of exceeding 31°C[6]. No moral judgment on trading is offered; the facts alone guide the probability assessment.

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

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 Prediction Market UK. 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.