Highest temperature in Guangzhou on July 4?

Platform comparison

Market context

On 4 July 2026, the highest temperature recorded at Guangzhou Baiyun International Airport will determine the outcome of this Polymarket contract, currently priced at 0% YES for a 31°C threshold. The on-chain mechanics involve USDC settled on Polygon, where conditional tokens reflect the crowd’s stark dismissal of hitting that mark today, despite the underlying weather reality.

Historically, July is Guangzhou’s hottest month, with daily highs averaging 33°C (91°F) and rarely dipping below 29°C (85°F)[1][4]. AccuWeather’s 2026 forecast for July shows highs ranging from 87°F to 100°F (31°C to 38°C), suggesting the 31°C threshold is climatologically probable, yet monsoon positioning and cloud cover may suppress peak temperatures on this specific date[2]. The current 0% price appears to ignore these historical baselines, possibly overreacting to short-term cloud forecasts or misinterpreting the settlement window’s timing.

Traders should monitor the official Wunderground daily update for ZGGG at 12:00 UTC on 4 July, which will serve as the resolution source, alongside any real-time Met Office alerts for rain or gusts that could lower peak heat[8]. Recent reports note Guangzhou experienced its longest summer since 1961, with record summer days pushing average temperatures higher, a trend that could support a hotter outcome if monsoon clouds do not fully obscure the sun[6]. The 80% rain chance forecast for the day remains a critical dependency, as precipitation would likely cap temperatures below 31°C[8].

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 Polymarket Scam?, 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 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'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.

Do I need to KYC for this market?

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