Pronóstico: Highest temperature in Guangzhou on July 20?

Platform comparison

Market context

Guangzhou’s peak heat on 20 July 2026 will be measured at the Baiyun International Airport station, with the market settling on the Celsius range that contains that day’s highest reading. Today, Polymarket prices the YES contract at 0%, implying the crowd sees no chance the temperature will hit the specific threshold tied to that outcome, even as summer in southern China typically delivers scorching highs.

Historically, Guangzhou in mid-July often sees maximum temperatures between 33°C and 36°C, with several years exceeding 37°C under clear skies and weak monsoon influence. For instance, July 2023 recorded a peak of 38.1°C at Baiyun, while 2021 and 2022 stayed just below 36°C, showing how sensitive the city is to short-term atmospheric shifts like cloud cover or rain fronts [1]. The current 0% probability suggests traders believe the threshold in question is far above any plausible historical or seasonal maximum for this date.

Traders should monitor the China Meteorological Administration’s daily forecasts for the Pearl River Delta, particularly any updates on subtropical ridge positioning or incoming tropical systems that could suppress temperatures. A recent report from the South China Morning Post noted that early July 2026 has seen persistent high-pressure conditions over Guangdong, which typically elevate daytime highs but can be disrupted by sudden convective rainfall [2]. Settlement depends entirely on Wunderground’s recorded maximum for ZGGG, so any discrepancy between forecast models and actual station data could create sharp price moves before the 2026-07-20T12:00:00Z deadline.

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 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.

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.