Highest temperature in Guangzhou on July 6?

Platform comparison

Market context

On 6 July 2026, the real-world event at stake is the peak temperature recorded at Guangzhou Baiyun International Airport, measured in degrees Celsius and sourced from Wunderground. This single daily high will determine the market resolution, with the settlement window closing at 12:00 UTC on the same day. The current crowd-implied probability of 0% for a YES outcome suggests traders believe the temperature will not fall within the specific range being bet on, likely a high threshold such as 32°C or above.

Historically, July is Guangzhou’s hottest month, with an average temperature of 28.3°C and daily highs frequently reaching 33°C or more, classifying them as “extreme hot days” per Greenpeace’s 33°C threshold [1][5]. Recent data shows extreme hot days above 33°C have more than doubled since the 1960s across East Asia, and summer now arrives earlier in over 80% of studied cities, including Guangzhou [1][6]. In July 2023, China experienced its hottest month on record since 1961, with an average of 23.2°C, reinforcing the trend of intensifying heat [3].

A programmatically minded trader should monitor real-time Wunderground feeds for the Baiyun Airport station, cross-referencing with satellite heat maps and local meteorological bulletins for sudden convective activity or cloud cover shifts. Key catalysts include official heatwave advisories from the Guangdong Meteorological Bureau and any scheduled industrial cooling releases that could alter local thermal dynamics. Recent reports confirm Guangzhou recorded its longest summer since 1961, with average temperatures hitting 23.3°C, indicating sustained thermal pressure that could push peak highs well above 32°C [6]. Conditional orders triggered by Wunderground’s hourly updates would allow precise entry before the settlement deadline.

Sources: 1 · 2 · 3 · 4 · 5

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

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 Review UK. 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.

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.