Highest temperature in Guangzhou on July 7?

Platform comparison

Market context

The real-world event concerns the peak temperature recorded at Guangzhou Baiyun International Airport on 7 July 2026, with the current market assigning a zero per cent chance to the highest temperature falling within the 31°C range. This 0% implied probability suggests traders view 31°C as virtually impossible for mid-summer in this region, where historical data confirms daily highs typically hover around 33°C (91°F) and rarely dip below 29°C (85°F) [2][6].

Historical patterns from July 2026 show average highs ranging between 84°F and 99°F, with the climatological average sitting firmly at 32–33°C, making a 31°C peak an outlier that would require significant cooling anomalies [4][7]. The structural divergence is stark: while sportsbooks on similar contracts (such as the 34°C peak on 3 July) price precise outcomes at roughly 27.5% due to bucket competition, the 31°C contract here is priced at 0%, indicating analysts consensus that temperatures will exceed this threshold by several degrees [1].

Traders should monitor scattered convective activity common in early July, which can temporarily lower temperatures, though high humidity usually sustains heat above 32°C [7]. Recent reports from the China Meteorological Administration note Guangzhou experienced its longest summer since 1961, with record average temperatures of 23.3°C, reinforcing the likelihood of sustained high peaks rather than cooling dips [3][8]. Any official weather service updates or new forecast model runs released before the 12:00 UTC settlement window will be the primary catalysts for price movement, though the 0% baseline remains robust given the seasonal norms.

Sources: 1 · 2 · 3 · 4 · 5

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 Best Prediction Markets UK, 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 Best Prediction Markets 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.

Do I need to KYC for this market?

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