Highest temperature in Beijing on August 3?

Platform comparison

Market context

Beijing Capital International Airport’s peak temperature on 3 August will be judged against a summer baseline that is usually hot but not extreme, with August averages around 31°C and typical highs in the low 30s. That makes a **0% YES** price on an above-average reading look starkly conservative versus the local climate norm, but it is not unusual for single-day temperature contracts to trade with very low odds when the settlement threshold is relatively high and the day’s maximum is still uncertain.

The main comparison points are the market’s own pricing and the weather outlook. Polymarket’s event page points to daytime highs near **33°C** in Beijing, with thundery showers that could trim the peak, while a Hong Kong government city forecast issued on 2 August put Beijing at **25–32°C** with thunderstorms. That leaves a meaningful gap between the crowd’s flat pricing and the more conditional model language: traders are effectively weighing whether cloud cover and rain cap the airport reading near the low 30s, or whether brief clearing allows a hotter spike. Historical August data for Beijing shows highs commonly around **31–32°C**, so the key question is not whether it will be warm, but whether the airport station reaches the upper end of the normal range.

The live catalysts are meteorological rather than event-driven: the timing of afternoon convection, shower coverage near the airport, and any short-lived ridge influence that suppresses cloud build-up. With settlement tied specifically to the **Beijing Capital International Airport Station** and the highest reading recorded on the day, intraday swings matter more than the morning forecast. The market should therefore be read as a comparison between broad August climatology, a moderately warm official forecast, and the crowd’s view that the airport’s top print will likely stay below the contract’s settlement band.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, 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

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'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 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.

Do I need to KYC for this market?

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