Highest temperature in Guangzhou on June 27?

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Market context

The real-world event centres on the peak heat recorded at Guangzhou Baiyun International Airport on 27 June 2026, a date historically prone to extreme subtropical humidity and temperatures often exceeding 35°C. Current crowd-implied probability sits at 0% YES, suggesting traders believe the temperature will fall outside the specific range being wagered on, despite historical data showing June highs frequently reaching 36.6°C in the city[1].

Historical patterns frame this low probability as potentially counter-intuitive, given that Guangzhou has experienced heatwaves with daily maximums over 35°C for at least three consecutive days in recent years, and the number of extreme hot days above 33°C has more than doubled since the 1960s[3]. May 2026 was already recorded as the hottest May in history with peaks up to 36.3°C, indicating a trend of earlier and more intense summer arrivals that could persist into June[5].

A power-user approaching this programmatically would monitor real-time Wunderground feeds for the Baiyun station, setting conditional orders to trigger if temperatures breach 35°C before the settlement window closes at 12:00 UTC on 27 June. Traders must watch for announcements regarding the subtropical high-pressure system, which heavily influences local temperatures, and any incoming typhoon warnings that could abruptly lower heat levels, as June remains one of the wettest months with occasional heavy storms[1]. The primary dependency is the stability of the high-pressure ridge, which recent climate analyses confirm is driving the rise in extreme hot days across East Asia[3].

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Bot UK, 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, Polymarket Bot UK triggers a quick verification flow that finishes in minutes.