Highest temperature in Beijing on August 8?

Platform comparison

Market context

Beijing’s airport temperature is currently trading as a hot-day outcome rather than an extreme-heat breakout, with live forecasts clustering around the low 30s Celsius and no clear sign of a major rain-cooled cap to the afternoon maximum. Independent weather pages are pointing to highs of about 31–34°C for 8 August, while Weather Underground is showing 89°F/31.7°C at Beijing Capital International Airport and the market’s 0% implied YES suggests traders are pricing in a result below the contract’s target band or simply treating the contract as mispriced.[4][6][10][15][18]

Historically, Beijing in August usually sits near the 30°C mark, so a finish in the low 30s is ordinary rather than exceptional, which helps explain why the contract is not attracting a broad consensus for a high-range settlement. Comparable forecasts this week from Chinese and international weather services also sit close together, with little divergence between 31°C and 34°C highs, a spread that is meaningful for this market because the settlement depends on the *highest* reading at the airport station rather than the broader city forecast.[2][4][10][13][20] That makes the current 0% crowd view notably more pessimistic than the weather consensus implied by the forecast range, even if exact sportsbook-style lines are not widely published for this contract.

The main catalysts for traders are the daytime temperature trend at Beijing Capital International Airport, any convective cloud build-up, and whether brief rain or haze suppresses the late-afternoon peak before the 12:00 UTC settlement window closes. Weather Underground’s station updates are especially important here because the market resolves off the Daily Observations table, not the summary high/low box, so intraday swings or a late update can change the outcome even if the headline forecast stays unchanged.[6][10]

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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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?

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.

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.