Highest temperature in Guangzhou on July 7?

Platform comparison

Market context

On 7 July 2026, the real-world event in question is the peak temperature recorded at Guangzhou Baiyun International Airport, with the market asking whether that high will land in a specific degree range. The current crowd-implied probability of 0% YES suggests traders believe the outcome will not match the contracted range, despite Guangzhou’s typical July highs clustering around 32–33°C. Historical data shows daily highs in July rarely dip below 85°F (29.4°C) or exceed 96°F (35.6°C), with the average high near 91°F (32.8°C) [3]. Comparable prediction markets for Guangzhou on 3 July 2026 saw a 34°C contract priced at 27.5%, reflecting structural odds rather than pure temperature forecasts [1]. This divergence highlights how narrow outcome buckets—eleven in total—compress probability, making precise matches inherently unlikely even in hot climates.

Traders should monitor updated forecast model runs from official weather services and Wunderground’s daily updates, as new data can sharply swing prices in the final 24 hours [1]. Recent reports confirm China is experiencing record heat waves, with July 2026 averaging 23.2°C—the highest since 1961—suggesting elevated baseline temperatures that could push Guangzhou’s peak above typical ranges [4]. Any announcement of thunderstorms or heavy rain, which are common in Guangzhou’s July climate, could suppress peak temperatures and alter the outcome [5]. The settlement window ends 2026-07-07T12:00:00Z, so real-time Wunderground data will be the definitive resolution source [7]. Unlike sportsbook lines that often smooth odds across broader ranges, prediction markets like this one isolate single-degree outcomes, creating meaningful divergence between analyst consensus and implied probabilities.

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

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 Kalshi vs Polymarket 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.