Highest temperature in Guangzhou on June 27?

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Market context

On 27 June 2026, the highest temperature recorded at Guangzhou Baiyun International Airport will determine the outcome of a prediction market settled in USDC, with the current crowd-implied probability of a “YES” resolution sitting at 0%. This reflects an expectation that the peak temperature will fall outside the specified range, likely due to the region’s typical June weather patterns, which are dominated by heavy thunderstorms and persistent cloud cover rather than clear, scorching heat.

Historically, June in Guangzhou is one of the wettest months, with average rainfall near 280 mm and frequent thunderstorms that suppress daytime temperatures, even though the subtropical high-pressure system can occasionally drive extremes. The highest temperature ever recorded in June was 36.6°C, but such peaks are rare and usually occur during short spells of continuous sunny days, as seen in May 2026 when temperatures reached 36.3°C[1][4]. Given that 27 June is forecast to feature thunderstorms with heavy rain and a maximum of 31°C, the 0% probability aligns with comparable cases where cloud cover and precipitation limit heat accumulation[3].

Traders should monitor real-time updates from Wunderground for the official hourly maximum, as well as broader weather model revisions that could signal a sudden shift to clearer skies. Any announcement of a typhoon or sustained rain event would further reduce the chance of high temperatures, while a break in the storm pattern could introduce volatility. With BTC and ETH funding rates currently stable and whale flows neutral, there is no immediate macro catalyst affecting crypto-linked sentiment, but spot exchange activity may rise if weather forecasts shift unexpectedly[2]. The settlement window closes at 12:00 UTC on 27 June, so timely data from Wunderground will be critical for final resolution[6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Where can I trade this market with the lowest fees?

On BTC Prediction, 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.

Is this market available outside the US?

BTC Prediction is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, BTC Prediction 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.