Pronóstico: Highest temperature in Guangzhou on June 27?

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Market context

Guangzhou is entering its peak summer heat phase on 27 June 2026, with the city currently under the influence of a subtropical high-pressure system that drives extreme humidity and temperatures. Historical records show the highest temperature ever reached in Guangzhou during June was 36.6°C, while recent May data indicates the city experienced continuous sunny days with highs up to 36.3°C, marking it the hottest May in history[1][5]. Despite this trend, current crowd-implied probability for a high-temperature outcome sits at 0% YES, a stark contrast to the typical June pattern where average highs range between 32°C and 35°C, often punctuated by thunderstorms and heavy rain[2][6].

Traders must monitor immediate weather forecasts for the Baiyun International Airport Station, specifically the potential for typhoons or heavy downpours that could suppress temperatures below the 35°C threshold required for a "YES" resolution[1]. The settlement window ends at 12:00 UTC on 27 June, meaning the highest temperature recorded for all times on that day will determine the outcome, with recent climate data suggesting a 31°C average for thunderstorm days in late June[6]. While heatwaves affecting East Asian metropolises have doubled since the 1960s, the current 0% probability suggests the market expects significant rainfall or cloud cover to dominate the day, overriding the typical subtropical heat spike[3]. Watch Wunderground updates for the specific station ZGGG to confirm if the forecast shifts from thunderstorms to clear skies before the 12:00 UTC cutoff[9].

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. 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 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.

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.