Highest temperature in Guangzhou on August 1?

Platform comparison

Market context

Guangzhou Baiyun International Airport Station will need to print a *very* mild reading for the 0% YES crowd to look wrong, because August in Guangzhou is normally hot, humid and rain-prone. Long-run climate data put August average highs around 33°C to 34°C, with typical daily highs near 32°C and some historical August peaks reaching 37°C to 39°C in extreme years.[1][4][20] On that basis, a contract that resolves on the day’s highest recorded temperature should be read against the station’s intraday maximum rather than the forecast average, which means even a modestly warm afternoon can still leave room for a much higher final high if sunshine breaks through before storms build.[5][13]

The market’s 0% implied YES price stands out against both climatology and the live forecast picture. AccuWeather’s August 2026 outlook for Guangzhou shows daily highs mostly between 89°F and 93°F, roughly 32°C to 34°C, which aligns with the broader seasonal norm and implies the centre of gravity is well above the sub-30°C bands that would favour a low-temperature resolution.[11] By contrast, historical August tables show day-to-day volatility is significant, with early-month highs sometimes near 33°C on 1 August and much hotter surges later in the month, so traders should focus on whether rain, cloud cover and tropical convection cap the daytime maximum below the usual low-30s range.[5][12]

For catalysts, the key dependency is the hourly path of Guangzhou’s weather through the local afternoon, not just the morning reading: if the station records its maximum before thunderstorms or heavy cloud arrive, the outcome can settle in a lower band even on a generally hot day.[5][20] The resolution source is Wunderground’s history page for Guangzhou Baiyun International Airport, so any trader checking cross-platform odds should compare prediction-market pricing with bookmaker-style weather forecasts and the observed intraday trend rather than relying on monthly averages alone.[13]

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). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.