Highest temperature in Guangzhou on June 27?

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Market context

Guangzhou Baiyun International Airport is expected to record its daily peak temperature on 27 June 2026, a critical real-world event that determines the resolution of this weather prediction market. Historical data confirms that late June in this subtropical monsoon city typically sees daytime highs clustering between 31°C and 35°C, with extremes occasionally surpassing 38°C during humid, overcast conditions [1][7]. The current crowd-implied probability of 0% for the "YES" outcome suggests the market believes the temperature will not reach a specific threshold, yet comparable cases from recent years show that late June highs often sit firmly within the 32°C to 35°C band, making a 32°C peak plausible given typical synoptic patterns [7]. Traders should scrutinise whether the market is misinterpreting the tight clustering of historical highs as a guarantee against higher extremes, as the region’s abundant humidity and frequent downpours can drive temperatures upward unexpectedly [1][4].

Key catalysts for this market include the scheduled release of official meteorological data from Wunderground and any sudden shifts in regional weather patterns, such as the arrival of typhoons or heavy thunderstorms that often influence July to September weather [1]. A recent report from Xinhua News Agency highlights that Guangzhou has experienced its longest summer since 1961, with average temperatures reaching record levels, which could significantly impact the peak temperature recorded on the settlement date [8]. Regulatory frameworks also shape accessibility: under the German GlüStV, prediction markets face strict licensing requirements, while the US CFTC maintains broad reach over digital commodity derivatives, potentially limiting participation for US residents. However, the "no-KYC up to $1,500" provision allows traders to access this specific market without identity verification for smaller stakes, enhancing liquidity despite these regulatory hurdles. Traders must monitor the official Wunderground feed closely, as the resolution source is explicitly tied to the highest temperature recorded for all times on this day at the designated station [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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.

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.