Highest temperature in Guangzhou on July 20?

Platform comparison

Market context

Guangzhou’s July heat is relentless, with typical daily highs reaching 32°C and lows around 25°C, making a 0% YES probability on any extreme high temperature range appear mispriced by the crowd [1]. On Polymarket, this contract trades in USDC on the Polygon network using conditional tokens, where the zero per cent implied chance suggests traders expect the peak to stay within moderate bands rather than breach higher thresholds.

Historical July data from Guangzhou Baiyun International Airport shows consistent peaks near 32–34°C, with rare spikes above 36°C only during prolonged heatwaves linked to weak monsoon activity. Comparable cases from 2023 and 2024 saw maximums of 35.1°C and 34.8°C respectively, framing the current 0% probability as overly cautious unless a significant cooling anomaly is forecast.

Traders should monitor the China Meteorological Administration’s daily high-temperature bulletins and Wunderground’s real-time hourly records for the Baiyun station, as settlement hinges entirely on that single source. A recent forecast from the Guangdong Meteorological Service indicates stable subtropical conditions with no extreme heatwave alerts for mid-July 2026, but any sudden shift in the Pacific subtropical ridge could rapidly alter temperature trajectories before the 2026-07-20T12:00:00Z settlement window closes [1].

Sources: 1

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Scam?, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Scam?. 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.

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.