Highest temperature in Guangzhou on June 27?

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Market context

The underlying event is the peak heat recorded at Guangzhou Baiyun International Airport on 27 June 2026, a date historically prone to thunderstorms and heavy rain that suppress maximum temperatures. While the crowd-implied probability sits at 0% for a high-temperature outcome, this reflects a consensus that the subtropical monsoon climate will deliver cloud cover and precipitation, preventing the air from reaching record-breaking highs. Historical data shows June is one of the wettest months, with average rainfall of 280 mm and frequent typhoons, making extreme heat an underdog scenario rather than a favourite [1][2]. The highest recorded temperature in June remains 36.6°C, but recent years show a pattern of thunderstorms on 27 June specifically, with temperatures hovering near 31°C [1][2].

Traders should watch the immediate forecast for typhoon development and the timing of the subtropical high-pressure system, as these are the primary catalysts that could shift the market from a contrarian low to a value spot on high heat. A recent report noted Guangzhou experienced continuous sunny days in May with peaks up to 36.3°C, suggesting the region is capable of extreme heat if the rain pattern breaks [4]. However, the current dependency is on whether the wet season persists into late June; if the rain clears unexpectedly, the value might sit on the high side despite the 0% consensus. The settlement window closes at 12:00 UTC, so the morning forecast is critical for confirming if the thunderstorm pattern holds or if a heatwave emerges [2].

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). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

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 Who Will Win 2026?

Zero. Who Will Win 2026 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, Who Will Win 2026 triggers a quick verification flow that finishes in minutes.

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.