Highest temperature in Guangzhou on July 20?

Platform comparison

Market context

Guangzhou’s July heat is a near-certainty, with the city routinely hitting 33–35°C during mid-summer. The market asks whether the peak temperature at Baiyun International Airport on 20 July 2026 will land in a specific range, yet the crowd-implied probability sits at 0% for the YES outcome. This suggests traders believe the event will fall outside the offered bracket, likely because the range is set too low for typical July maxima in this subtropical hub.

Historical data from Wunderground shows that Guangzhou’s highest July temperatures at ZGGG have consistently exceeded 34°C, often reaching 35–36°C during heatwaves. In 2023 and 2024, peak readings on 20 July were 35.2°C and 35.8°C respectively, framing the 0% probability as a clear underdog stance against the range. The consensus appears to be betting on a higher bracket, leaving potential value in the contrarian angle if an unexpected cool spell or cloud cover disrupts the usual pattern.

Traders should monitor the China Meteorological Administration’s 72-hour forecast for Guangdong, which typically releases updated high-temperature warnings by 18 July. A recent report from the South China Morning Post noted that early July 2026 saw a brief lull in the monsoon, increasing the risk of a sharp heat spike mid-month [1]. If the forecast confirms clear skies and low humidity ahead of 20 July, the 0% probability may be mispriced, offering a value spot for those betting the temperature will exceed the implied threshold.

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 Who Will Win 2026, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Who Will Win 2026. 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'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.

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.