Highest temperature in Guangzhou on July 4?

Platform comparison

Market context

Guangzhou is entering its peak summer heatwave, with July historically delivering the year’s most torrid conditions. The market asks whether the highest temperature at Baiyun International Airport on 4 July 2026 will reach 31°C, yet the crowd-implied probability sits at 0% YES, suggesting near-total consensus that this threshold will not be breached. This stance contradicts climatology: average daily highs in July routinely span 33°C to 35°C, with peaks frequently hitting 39°C, as seen on 25 July 2024[3][5]. The 0% pricing appears to misread the underdog’s strength; value likely lies on the contrarian side, betting that 31°C will indeed be surpassed given the region’s typical thermal intensity[1][2].

Traders should monitor real-time weather bulletins from the China Meteorological Administration and Wunderground’s hourly updates for the Baiyun station, particularly any sudden cloud cover or monsoon-driven cooling that might suppress temperatures below the norm[4]. Recent reports confirm Guangzhou experienced its longest summer since 1961, reinforcing the likelihood of sustained high heat through early July[7]. No official announcements have yet indicated anomalous cooling, meaning the default expectation remains extreme warmth. The consensus overweights rare low-temperature outliers, while the true value sits with the historical pattern: 31°C is a low bar in Guangzhou’s July climate, making the 0% probability a clear mispricing[3][6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Guangzhou on July 4? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win 2026, which mirrors the Polymarket order book at 0% fees.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.