Pronóstico: Highest temperature in Guangzhou on June 27?

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Market context

Guangzhou on 27 June 2026 will see its peak temperature recorded at the Baiyun International Airport station, a real-world metric that determines this market’s outcome. Today, Polymarket prices the YES contract at 0%, implying the crowd believes the temperature will fall outside the specified range. This on-chain conditional token, settled in USDC on Polygon, reflects a stark divergence from historical patterns where June highs routinely hit 32°C to 33°C, with the all-time record reaching 36.6°C[1][4].

Historical data frames this 0% probability as highly questionable. June is one of Guangzhou’s wettest months, yet it remains extremely hot and humid under the subtropical high-pressure system, with daily highs averaging 89°F (32°C) and rarely dropping below 80°F[1][3]. The city experienced its longest summer since 1961 recently, suggesting persistent heat anomalies that could push temperatures toward the upper range[9]. Traders should watch for official announcements on typhoon activity or heavy storm schedules, as these dependencies can suppress peaks, though the subtropical high often maintains intense warmth[1]. Recent reports from Xinhua confirm the prolonged heat trend, a catalyst that may invalidate the current crowd-implied odds[9].

The settlement window closes at 12:00 UTC on 27 June, with Wunderground serving as the definitive resolution source. USDC liquidity on this conditional token market is sensitive to real-time weather updates, particularly any sudden shifts in cloud cover or rainfall intensity. While typhoons are possible in June, the prevailing high-pressure influence typically sustains strong temperatures, making the 0% YES price a potential mispricing for informed traders monitoring the subtropical dynamics[1][6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Guangzhou on June 27? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.